chore: refactoring and tests, splitting up files (#12495)

20 files changed, 2610 insertions, 0 deletions

diff --git a/packages/app/src/pages/session/file-tab-scroll.test.ts b/packages/app/src/pages/session/file-tab-scroll.test.ts
new file mode 100644
index 000000000..89e0dcc8f
--- /dev/null
+++ b/packages/app/src/pages/session/file-tab-scroll.test.ts
@@ -0,0 +1,40 @@
+import { describe, expect, test } from "bun:test"
+import { nextTabListScrollLeft } from "./file-tab-scroll"
+
+describe("nextTabListScrollLeft", () => {
+  test("does not scroll when width shrinks", () => {
+    const left = nextTabListScrollLeft({
+      prevScrollWidth: 500,
+      scrollWidth: 420,
+      clientWidth: 300,
+      prevContextOpen: false,
+      contextOpen: false,
+    })
+
+    expect(left).toBeUndefined()
+  })
+
+  test("scrolls to start when context tab opens", () => {
+    const left = nextTabListScrollLeft({
+      prevScrollWidth: 400,
+      scrollWidth: 500,
+      clientWidth: 320,
+      prevContextOpen: false,
+      contextOpen: true,
+    })
+
+    expect(left).toBe(0)
+  })
+
+  test("scrolls to right edge for new file tabs", () => {
+    const left = nextTabListScrollLeft({
+      prevScrollWidth: 500,
+      scrollWidth: 780,
+      clientWidth: 300,
+      prevContextOpen: true,
+      contextOpen: true,
+    })
+
+    expect(left).toBe(480)
+  })
+})
diff --git a/packages/app/src/pages/session/file-tab-scroll.ts b/packages/app/src/pages/session/file-tab-scroll.ts
new file mode 100644
index 000000000..b69188d40
--- /dev/null
+++ b/packages/app/src/pages/session/file-tab-scroll.ts
@@ -0,0 +1,67 @@
+type Input = {
+  prevScrollWidth: number
+  scrollWidth: number
+  clientWidth: number
+  prevContextOpen: boolean
+  contextOpen: boolean
+}
+
+export const nextTabListScrollLeft = (input: Input) => {
+  if (input.scrollWidth <= input.prevScrollWidth) return
+  if (!input.prevContextOpen && input.contextOpen) return 0
+  if (input.scrollWidth <= input.clientWidth) return
+  return input.scrollWidth - input.clientWidth
+}
+
+export const createFileTabListSync = (input: { el: HTMLDivElement; contextOpen: () => boolean }) => {
+  let frame: number | undefined
+  let prevScrollWidth = input.el.scrollWidth
+  let prevContextOpen = input.contextOpen()
+
+  const update = () => {
+    const scrollWidth = input.el.scrollWidth
+    const clientWidth = input.el.clientWidth
+    const contextOpen = input.contextOpen()
+    const left = nextTabListScrollLeft({
+      prevScrollWidth,
+      scrollWidth,
+      clientWidth,
+      prevContextOpen,
+      contextOpen,
+    })
+
+    if (left !== undefined) {
+      input.el.scrollTo({
+        left,
+        behavior: "smooth",
+      })
+    }
+
+    prevScrollWidth = scrollWidth
+    prevContextOpen = contextOpen
+  }
+
+  const schedule = () => {
+    if (frame !== undefined) cancelAnimationFrame(frame)
+    frame = requestAnimationFrame(() => {
+      frame = undefined
+      update()
+    })
+  }
+
+  const onWheel = (e: WheelEvent) => {
+    if (Math.abs(e.deltaY) <= Math.abs(e.deltaX)) return
+    input.el.scrollLeft += e.deltaY > 0 ? 50 : -50
+    e.preventDefault()
+  }
+
+  input.el.addEventListener("wheel", onWheel, { passive: false })
+  const observer = new MutationObserver(schedule)
+  observer.observe(input.el, { childList: true })
+
+  return () => {
+    input.el.removeEventListener("wheel", onWheel)
+    observer.disconnect()
+    if (frame !== undefined) cancelAnimationFrame(frame)
+  }
+}
diff --git a/packages/app/src/pages/session/file-tabs.tsx b/packages/app/src/pages/session/file-tabs.tsx
new file mode 100644
index 000000000..0c8281a66
--- /dev/null
+++ b/packages/app/src/pages/session/file-tabs.tsx
@@ -0,0 +1,516 @@
+import { type ValidComponent, createEffect, createMemo, For, Match, on, onCleanup, Show, Switch } from "solid-js"
+import { createStore } from "solid-js/store"
+import { Dynamic } from "solid-js/web"
+import { checksum } from "@opencode-ai/util/encode"
+import { decode64 } from "@/utils/base64"
+import { showToast } from "@opencode-ai/ui/toast"
+import { LineComment as LineCommentView, LineCommentEditor } from "@opencode-ai/ui/line-comment"
+import { Mark } from "@opencode-ai/ui/logo"
+import { Tabs } from "@opencode-ai/ui/tabs"
+import { useLayout } from "@/context/layout"
+import { useFile, type SelectedLineRange } from "@/context/file"
+import { useComments } from "@/context/comments"
+import { useLanguage } from "@/context/language"
+
+export function FileTabContent(props: {
+  tab: string
+  activeTab: () => string
+  tabs: () => ReturnType<ReturnType<typeof useLayout>["tabs"]>
+  view: () => ReturnType<ReturnType<typeof useLayout>["view"]>
+  handoffFiles: () => Record<string, SelectedLineRange | null> | undefined
+  file: ReturnType<typeof useFile>
+  comments: ReturnType<typeof useComments>
+  language: ReturnType<typeof useLanguage>
+  codeComponent: NonNullable<ValidComponent>
+  addCommentToContext: (input: {
+    file: string
+    selection: SelectedLineRange
+    comment: string
+    preview?: string
+    origin?: "review" | "file"
+  }) => void
+}) {
+  let scroll: HTMLDivElement | undefined
+  let scrollFrame: number | undefined
+  let pending: { x: number; y: number } | undefined
+  let codeScroll: HTMLElement[] = []
+
+  const path = createMemo(() => props.file.pathFromTab(props.tab))
+  const state = createMemo(() => {
+    const p = path()
+    if (!p) return
+    return props.file.get(p)
+  })
+  const contents = createMemo(() => state()?.content?.content ?? "")
+  const cacheKey = createMemo(() => checksum(contents()))
+  const isImage = createMemo(() => {
+    const c = state()?.content
+    return c?.encoding === "base64" && c?.mimeType?.startsWith("image/") && c?.mimeType !== "image/svg+xml"
+  })
+  const isSvg = createMemo(() => {
+    const c = state()?.content
+    return c?.mimeType === "image/svg+xml"
+  })
+  const isBinary = createMemo(() => state()?.content?.type === "binary")
+  const svgContent = createMemo(() => {
+    if (!isSvg()) return
+    const c = state()?.content
+    if (!c) return
+    if (c.encoding !== "base64") return c.content
+    return decode64(c.content)
+  })
+
+  const svgDecodeFailed = createMemo(() => {
+    if (!isSvg()) return false
+    const c = state()?.content
+    if (!c) return false
+    if (c.encoding !== "base64") return false
+    return svgContent() === undefined
+  })
+
+  const svgToast = { shown: false }
+  createEffect(() => {
+    if (!svgDecodeFailed()) return
+    if (svgToast.shown) return
+    svgToast.shown = true
+    showToast({
+      variant: "error",
+      title: props.language.t("toast.file.loadFailed.title"),
+      description: "Invalid base64 content.",
+    })
+  })
+  const svgPreviewUrl = createMemo(() => {
+    if (!isSvg()) return
+    const c = state()?.content
+    if (!c) return
+    if (c.encoding === "base64") return `data:image/svg+xml;base64,${c.content}`
+    return `data:image/svg+xml;charset=utf-8,${encodeURIComponent(c.content)}`
+  })
+  const imageDataUrl = createMemo(() => {
+    if (!isImage()) return
+    const c = state()?.content
+    return `data:${c?.mimeType};base64,${c?.content}`
+  })
+  const selectedLines = createMemo(() => {
+    const p = path()
+    if (!p) return null
+    if (props.file.ready()) return props.file.selectedLines(p) ?? null
+    return props.handoffFiles()?.[p] ?? null
+  })
+
+  let wrap: HTMLDivElement | undefined
+
+  const fileComments = createMemo(() => {
+    const p = path()
+    if (!p) return []
+    return props.comments.list(p)
+  })
+
+  const commentedLines = createMemo(() => fileComments().map((comment) => comment.selection))
+
+  const [note, setNote] = createStore({
+    openedComment: null as string | null,
+    commenting: null as SelectedLineRange | null,
+    draft: "",
+    positions: {} as Record<string, number>,
+    draftTop: undefined as number | undefined,
+  })
+
+  const openedComment = () => note.openedComment
+  const setOpenedComment = (
+    value: typeof note.openedComment | ((value: typeof note.openedComment) => typeof note.openedComment),
+  ) => setNote("openedComment", value)
+
+  const commenting = () => note.commenting
+  const setCommenting = (value: typeof note.commenting | ((value: typeof note.commenting) => typeof note.commenting)) =>
+    setNote("commenting", value)
+
+  const draft = () => note.draft
+  const setDraft = (value: typeof note.draft | ((value: typeof note.draft) => typeof note.draft)) =>
+    setNote("draft", value)
+
+  const positions = () => note.positions
+  const setPositions = (value: typeof note.positions | ((value: typeof note.positions) => typeof note.positions)) =>
+    setNote("positions", value)
+
+  const draftTop = () => note.draftTop
+  const setDraftTop = (value: typeof note.draftTop | ((value: typeof note.draftTop) => typeof note.draftTop)) =>
+    setNote("draftTop", value)
+
+  const commentLabel = (range: SelectedLineRange) => {
+    const start = Math.min(range.start, range.end)
+    const end = Math.max(range.start, range.end)
+    if (start === end) return `line ${start}`
+    return `lines ${start}-${end}`
+  }
+
+  const getRoot = () => {
+    const el = wrap
+    if (!el) return
+
+    const host = el.querySelector("diffs-container")
+    if (!(host instanceof HTMLElement)) return
+
+    const root = host.shadowRoot
+    if (!root) return
+
+    return root
+  }
+
+  const findMarker = (root: ShadowRoot, range: SelectedLineRange) => {
+    const line = Math.max(range.start, range.end)
+    const node = root.querySelector(`[data-line="${line}"]`)
+    if (!(node instanceof HTMLElement)) return
+    return node
+  }
+
+  const markerTop = (wrapper: HTMLElement, marker: HTMLElement) => {
+    const wrapperRect = wrapper.getBoundingClientRect()
+    const rect = marker.getBoundingClientRect()
+    return rect.top - wrapperRect.top + Math.max(0, (rect.height - 20) / 2)
+  }
+
+  const updateComments = () => {
+    const el = wrap
+    const root = getRoot()
+    if (!el || !root) {
+      setPositions({})
+      setDraftTop(undefined)
+      return
+    }
+
+    const next: Record<string, number> = {}
+    for (const comment of fileComments()) {
+      const marker = findMarker(root, comment.selection)
+      if (!marker) continue
+      next[comment.id] = markerTop(el, marker)
+    }
+
+    setPositions(next)
+
+    const range = commenting()
+    if (!range) {
+      setDraftTop(undefined)
+      return
+    }
+
+    const marker = findMarker(root, range)
+    if (!marker) {
+      setDraftTop(undefined)
+      return
+    }
+
+    setDraftTop(markerTop(el, marker))
+  }
+
+  const scheduleComments = () => {
+    requestAnimationFrame(updateComments)
+  }
+
+  createEffect(() => {
+    fileComments()
+    scheduleComments()
+  })
+
+  createEffect(() => {
+    const range = commenting()
+    scheduleComments()
+    if (!range) return
+    setDraft("")
+  })
+
+  createEffect(() => {
+    const focus = props.comments.focus()
+    const p = path()
+    if (!focus || !p) return
+    if (focus.file !== p) return
+    if (props.activeTab() !== props.tab) return
+
+    const target = fileComments().find((comment) => comment.id === focus.id)
+    if (!target) return
+
+    setOpenedComment(target.id)
+    setCommenting(null)
+    props.file.setSelectedLines(p, target.selection)
+    requestAnimationFrame(() => props.comments.clearFocus())
+  })
+
+  const getCodeScroll = () => {
+    const el = scroll
+    if (!el) return []
+
+    const host = el.querySelector("diffs-container")
+    if (!(host instanceof HTMLElement)) return []
+
+    const root = host.shadowRoot
+    if (!root) return []
+
+    return Array.from(root.querySelectorAll("[data-code]")).filter(
+      (node): node is HTMLElement => node instanceof HTMLElement && node.clientWidth > 0,
+    )
+  }
+
+  const queueScrollUpdate = (next: { x: number; y: number }) => {
+    pending = next
+    if (scrollFrame !== undefined) return
+
+    scrollFrame = requestAnimationFrame(() => {
+      scrollFrame = undefined
+
+      const out = pending
+      pending = undefined
+      if (!out) return
+
+      props.view().setScroll(props.tab, out)
+    })
+  }
+
+  const handleCodeScroll = (event: Event) => {
+    const el = scroll
+    if (!el) return
+
+    const target = event.currentTarget
+    if (!(target instanceof HTMLElement)) return
+
+    queueScrollUpdate({
+      x: target.scrollLeft,
+      y: el.scrollTop,
+    })
+  }
+
+  const syncCodeScroll = () => {
+    const next = getCodeScroll()
+    if (next.length === codeScroll.length && next.every((el, i) => el === codeScroll[i])) return
+
+    for (const item of codeScroll) {
+      item.removeEventListener("scroll", handleCodeScroll)
+    }
+
+    codeScroll = next
+
+    for (const item of codeScroll) {
+      item.addEventListener("scroll", handleCodeScroll)
+    }
+  }
+
+  const restoreScroll = () => {
+    const el = scroll
+    if (!el) return
+
+    const s = props.view()?.scroll(props.tab)
+    if (!s) return
+
+    syncCodeScroll()
+
+    if (codeScroll.length > 0) {
+      for (const item of codeScroll) {
+        if (item.scrollLeft !== s.x) item.scrollLeft = s.x
+      }
+    }
+
+    if (el.scrollTop !== s.y) el.scrollTop = s.y
+    if (codeScroll.length > 0) return
+    if (el.scrollLeft !== s.x) el.scrollLeft = s.x
+  }
+
+  const handleScroll = (event: Event & { currentTarget: HTMLDivElement }) => {
+    if (codeScroll.length === 0) syncCodeScroll()
+
+    queueScrollUpdate({
+      x: codeScroll[0]?.scrollLeft ?? event.currentTarget.scrollLeft,
+      y: event.currentTarget.scrollTop,
+    })
+  }
+
+  createEffect(
+    on(
+      () => state()?.loaded,
+      (loaded) => {
+        if (!loaded) return
+        requestAnimationFrame(restoreScroll)
+      },
+      { defer: true },
+    ),
+  )
+
+  createEffect(
+    on(
+      () => props.file.ready(),
+      (ready) => {
+        if (!ready) return
+        requestAnimationFrame(restoreScroll)
+      },
+      { defer: true },
+    ),
+  )
+
+  createEffect(
+    on(
+      () => props.tabs().active() === props.tab,
+      (active) => {
+        if (!active) return
+        if (!state()?.loaded) return
+        requestAnimationFrame(restoreScroll)
+      },
+    ),
+  )
+
+  onCleanup(() => {
+    for (const item of codeScroll) {
+      item.removeEventListener("scroll", handleCodeScroll)
+    }
+
+    if (scrollFrame === undefined) return
+    cancelAnimationFrame(scrollFrame)
+  })
+
+  const renderCode = (source: string, wrapperClass: string) => (
+    <div
+      ref={(el) => {
+        wrap = el
+        scheduleComments()
+      }}
+      class={`relative overflow-hidden ${wrapperClass}`}
+    >
+      <Dynamic
+        component={props.codeComponent}
+        file={{
+          name: path() ?? "",
+          contents: source,
+          cacheKey: cacheKey(),
+        }}
+        enableLineSelection
+        selectedLines={selectedLines()}
+        commentedLines={commentedLines()}
+        onRendered={() => {
+          requestAnimationFrame(restoreScroll)
+          requestAnimationFrame(scheduleComments)
+        }}
+        onLineSelected={(range: SelectedLineRange | null) => {
+          const p = path()
+          if (!p) return
+          props.file.setSelectedLines(p, range)
+          if (!range) setCommenting(null)
+        }}
+        onLineSelectionEnd={(range: SelectedLineRange | null) => {
+          if (!range) {
+            setCommenting(null)
+            return
+          }
+
+          setOpenedComment(null)
+          setCommenting(range)
+        }}
+        overflow="scroll"
+        class="select-text"
+      />
+      <For each={fileComments()}>
+        {(comment) => (
+          <LineCommentView
+            id={comment.id}
+            top={positions()[comment.id]}
+            open={openedComment() === comment.id}
+            comment={comment.comment}
+            selection={commentLabel(comment.selection)}
+            onMouseEnter={() => {
+              const p = path()
+              if (!p) return
+              props.file.setSelectedLines(p, comment.selection)
+            }}
+            onClick={() => {
+              const p = path()
+              if (!p) return
+              setCommenting(null)
+              setOpenedComment((current) => (current === comment.id ? null : comment.id))
+              props.file.setSelectedLines(p, comment.selection)
+            }}
+          />
+        )}
+      </For>
+      <Show when={commenting()}>
+        {(range) => (
+          <Show when={draftTop() !== undefined}>
+            <LineCommentEditor
+              top={draftTop()}
+              value={draft()}
+              selection={commentLabel(range())}
+              onInput={(value) => setDraft(value)}
+              onCancel={() => setCommenting(null)}
+              onSubmit={(value) => {
+                const p = path()
+                if (!p) return
+                props.addCommentToContext({
+                  file: p,
+                  selection: range(),
+                  comment: value,
+                  origin: "file",
+                })
+                setCommenting(null)
+              }}
+              onPopoverFocusOut={(e: FocusEvent) => {
+                const current = e.currentTarget as HTMLDivElement
+                const target = e.relatedTarget
+                if (target instanceof Node && current.contains(target)) return
+
+                setTimeout(() => {
+                  if (!document.activeElement || !current.contains(document.activeElement)) {
+                    setCommenting(null)
+                  }
+                }, 0)
+              }}
+            />
+          </Show>
+        )}
+      </Show>
+    </div>
+  )
+
+  return (
+    <Tabs.Content
+      value={props.tab}
+      class="mt-3 relative"
+      ref={(el: HTMLDivElement) => {
+        scroll = el
+        restoreScroll()
+      }}
+      onScroll={handleScroll}
+    >
+      <Switch>
+        <Match when={state()?.loaded && isImage()}>
+          <div class="px-6 py-4 pb-40">
+            <img
+              src={imageDataUrl()}
+              alt={path()}
+              class="max-w-full"
+              onLoad={() => requestAnimationFrame(restoreScroll)}
+            />
+          </div>
+        </Match>
+        <Match when={state()?.loaded && isSvg()}>
+          <div class="flex flex-col gap-4 px-6 py-4">
+            {renderCode(svgContent() ?? "", "")}
+            <Show when={svgPreviewUrl()}>
+              <div class="flex justify-center pb-40">
+                <img src={svgPreviewUrl()} alt={path()} class="max-w-full max-h-96" />
+              </div>
+            </Show>
+          </div>
+        </Match>
+        <Match when={state()?.loaded && isBinary()}>
+          <div class="h-full px-6 pb-42 flex flex-col items-center justify-center text-center gap-6">
+            <Mark class="w-14 opacity-10" />
+            <div class="flex flex-col gap-2 max-w-md">
+              <div class="text-14-semibold text-text-strong truncate">{path()?.split("/").pop()}</div>
+              <div class="text-14-regular text-text-weak">{props.language.t("session.files.binaryContent")}</div>
+            </div>
+          </div>
+        </Match>
+        <Match when={state()?.loaded}>{renderCode(contents(), "pb-40")}</Match>
+        <Match when={state()?.loading}>
+          <div class="px-6 py-4 text-text-weak">{props.language.t("common.loading")}...</div>
+        </Match>
+        <Match when={state()?.error}>{(err) => <div class="px-6 py-4 text-text-weak">{err()}</div>}</Match>
+      </Switch>
+    </Tabs.Content>
+  )
+}
diff --git a/packages/app/src/pages/session/message-gesture.test.ts b/packages/app/src/pages/session/message-gesture.test.ts
new file mode 100644
index 000000000..b2af4bb83
--- /dev/null
+++ b/packages/app/src/pages/session/message-gesture.test.ts
@@ -0,0 +1,62 @@
+import { describe, expect, test } from "bun:test"
+import { normalizeWheelDelta, shouldMarkBoundaryGesture } from "./message-gesture"
+
+describe("normalizeWheelDelta", () => {
+  test("converts line mode to px", () => {
+    expect(normalizeWheelDelta({ deltaY: 3, deltaMode: 1, rootHeight: 500 })).toBe(120)
+  })
+
+  test("converts page mode to container height", () => {
+    expect(normalizeWheelDelta({ deltaY: -1, deltaMode: 2, rootHeight: 600 })).toBe(-600)
+  })
+
+  test("keeps pixel mode unchanged", () => {
+    expect(normalizeWheelDelta({ deltaY: 16, deltaMode: 0, rootHeight: 600 })).toBe(16)
+  })
+})
+
+describe("shouldMarkBoundaryGesture", () => {
+  test("marks when nested scroller cannot scroll", () => {
+    expect(
+      shouldMarkBoundaryGesture({
+        delta: 20,
+        scrollTop: 0,
+        scrollHeight: 300,
+        clientHeight: 300,
+      }),
+    ).toBe(true)
+  })
+
+  test("marks when scrolling beyond top boundary", () => {
+    expect(
+      shouldMarkBoundaryGesture({
+        delta: -40,
+        scrollTop: 10,
+        scrollHeight: 1000,
+        clientHeight: 400,
+      }),
+    ).toBe(true)
+  })
+
+  test("marks when scrolling beyond bottom boundary", () => {
+    expect(
+      shouldMarkBoundaryGesture({
+        delta: 50,
+        scrollTop: 580,
+        scrollHeight: 1000,
+        clientHeight: 400,
+      }),
+    ).toBe(true)
+  })
+
+  test("does not mark when nested scroller can consume movement", () => {
+    expect(
+      shouldMarkBoundaryGesture({
+        delta: 20,
+        scrollTop: 200,
+        scrollHeight: 1000,
+        clientHeight: 400,
+      }),
+    ).toBe(false)
+  })
+})
diff --git a/packages/app/src/pages/session/message-gesture.ts b/packages/app/src/pages/session/message-gesture.ts
new file mode 100644
index 000000000..731cb1bde
--- /dev/null
+++ b/packages/app/src/pages/session/message-gesture.ts
@@ -0,0 +1,21 @@
+export const normalizeWheelDelta = (input: { deltaY: number; deltaMode: number; rootHeight: number }) => {
+  if (input.deltaMode === 1) return input.deltaY * 40
+  if (input.deltaMode === 2) return input.deltaY * input.rootHeight
+  return input.deltaY
+}
+
+export const shouldMarkBoundaryGesture = (input: {
+  delta: number
+  scrollTop: number
+  scrollHeight: number
+  clientHeight: number
+}) => {
+  const max = input.scrollHeight - input.clientHeight
+  if (max <= 1) return true
+  if (!input.delta) return false
+
+  if (input.delta < 0) return input.scrollTop + input.delta <= 0
+
+  const remaining = max - input.scrollTop
+  return input.delta > remaining
+}
diff --git a/packages/app/src/pages/session/message-timeline.tsx b/packages/app/src/pages/session/message-timeline.tsx
new file mode 100644
index 000000000..f536c7061
--- /dev/null
+++ b/packages/app/src/pages/session/message-timeline.tsx
@@ -0,0 +1,348 @@
+import { For, onCleanup, onMount, Show, type JSX } from "solid-js"
+import { Button } from "@opencode-ai/ui/button"
+import { Icon } from "@opencode-ai/ui/icon"
+import { IconButton } from "@opencode-ai/ui/icon-button"
+import { DropdownMenu } from "@opencode-ai/ui/dropdown-menu"
+import { InlineInput } from "@opencode-ai/ui/inline-input"
+import { Tooltip } from "@opencode-ai/ui/tooltip"
+import { SessionTurn } from "@opencode-ai/ui/session-turn"
+import type { UserMessage } from "@opencode-ai/sdk/v2"
+import { shouldMarkBoundaryGesture, normalizeWheelDelta } from "@/pages/session/message-gesture"
+
+export function MessageTimeline(props: {
+  mobileChanges: boolean
+  mobileFallback: JSX.Element
+  scroll: { overflow: boolean; bottom: boolean }
+  onResumeScroll: () => void
+  setScrollRef: (el: HTMLDivElement | undefined) => void
+  onScheduleScrollState: (el: HTMLDivElement) => void
+  onAutoScrollHandleScroll: () => void
+  onMarkScrollGesture: (target?: EventTarget | null) => void
+  hasScrollGesture: () => boolean
+  isDesktop: boolean
+  onScrollSpyScroll: () => void
+  onAutoScrollInteraction: (event: MouseEvent) => void
+  showHeader: boolean
+  centered: boolean
+  title?: string
+  parentID?: string
+  openTitleEditor: () => void
+  closeTitleEditor: () => void
+  saveTitleEditor: () => void | Promise<void>
+  titleRef: (el: HTMLInputElement) => void
+  titleState: {
+    draft: string
+    editing: boolean
+    saving: boolean
+    menuOpen: boolean
+    pendingRename: boolean
+  }
+  onTitleDraft: (value: string) => void
+  onTitleMenuOpen: (open: boolean) => void
+  onTitlePendingRename: (value: boolean) => void
+  onNavigateParent: () => void
+  sessionID: string
+  onArchiveSession: (sessionID: string) => void
+  onDeleteSession: (sessionID: string) => void
+  t: (key: string, vars?: Record<string, string | number | boolean>) => string
+  setContentRef: (el: HTMLDivElement) => void
+  turnStart: number
+  onRenderEarlier: () => void
+  historyMore: boolean
+  historyLoading: boolean
+  onLoadEarlier: () => void
+  renderedUserMessages: UserMessage[]
+  anchor: (id: string) => string
+  onRegisterMessage: (el: HTMLDivElement, id: string) => void
+  onUnregisterMessage: (id: string) => void
+  onFirstTurnMount?: () => void
+  lastUserMessageID?: string
+  expanded: Record<string, boolean>
+  onToggleExpanded: (id: string) => void
+}) {
+  let touchGesture: number | undefined
+
+  return (
+    <Show
+      when={!props.mobileChanges}
+      fallback={<div class="relative h-full overflow-hidden">{props.mobileFallback}</div>}
+    >
+      <div class="relative w-full h-full min-w-0">
+        <div
+          class="absolute left-1/2 -translate-x-1/2 bottom-[calc(var(--prompt-height,8rem)+32px)] z-[60] pointer-events-none transition-all duration-200 ease-out"
+          classList={{
+            "opacity-100 translate-y-0 scale-100": props.scroll.overflow && !props.scroll.bottom,
+            "opacity-0 translate-y-2 scale-95 pointer-events-none": !props.scroll.overflow || props.scroll.bottom,
+          }}
+        >
+          <button
+            class="pointer-events-auto size-8 flex items-center justify-center rounded-full bg-background-base border border-border-base shadow-sm text-text-base hover:bg-background-stronger transition-colors"
+            onClick={props.onResumeScroll}
+          >
+            <Icon name="arrow-down-to-line" />
+          </button>
+        </div>
+        <div
+          ref={props.setScrollRef}
+          onWheel={(e) => {
+            const root = e.currentTarget
+            const target = e.target instanceof Element ? e.target : undefined
+            const nested = target?.closest("[data-scrollable]")
+            if (!nested || nested === root) {
+              props.onMarkScrollGesture(root)
+              return
+            }
+
+            if (!(nested instanceof HTMLElement)) {
+              props.onMarkScrollGesture(root)
+              return
+            }
+
+            const delta = normalizeWheelDelta({
+              deltaY: e.deltaY,
+              deltaMode: e.deltaMode,
+              rootHeight: root.clientHeight,
+            })
+            if (!delta) return
+
+            if (
+              shouldMarkBoundaryGesture({
+                delta,
+                scrollTop: nested.scrollTop,
+                scrollHeight: nested.scrollHeight,
+                clientHeight: nested.clientHeight,
+              })
+            ) {
+              props.onMarkScrollGesture(root)
+            }
+          }}
+          onTouchStart={(e) => {
+            touchGesture = e.touches[0]?.clientY
+          }}
+          onTouchMove={(e) => {
+            const next = e.touches[0]?.clientY
+            const prev = touchGesture
+            touchGesture = next
+            if (next === undefined || prev === undefined) return
+
+            const delta = prev - next
+            if (!delta) return
+
+            const root = e.currentTarget
+            const target = e.target instanceof Element ? e.target : undefined
+            const nested = target?.closest("[data-scrollable]")
+            if (!nested || nested === root) {
+              props.onMarkScrollGesture(root)
+              return
+            }
+
+            if (!(nested instanceof HTMLElement)) {
+              props.onMarkScrollGesture(root)
+              return
+            }
+
+            if (
+              shouldMarkBoundaryGesture({
+                delta,
+                scrollTop: nested.scrollTop,
+                scrollHeight: nested.scrollHeight,
+                clientHeight: nested.clientHeight,
+              })
+            ) {
+              props.onMarkScrollGesture(root)
+            }
+          }}
+          onTouchEnd={() => {
+            touchGesture = undefined
+          }}
+          onTouchCancel={() => {
+            touchGesture = undefined
+          }}
+          onPointerDown={(e) => {
+            if (e.target !== e.currentTarget) return
+            props.onMarkScrollGesture(e.currentTarget)
+          }}
+          onScroll={(e) => {
+            props.onScheduleScrollState(e.currentTarget)
+            if (!props.hasScrollGesture()) return
+            props.onAutoScrollHandleScroll()
+            props.onMarkScrollGesture(e.currentTarget)
+            if (props.isDesktop) props.onScrollSpyScroll()
+          }}
+          onClick={props.onAutoScrollInteraction}
+          class="relative min-w-0 w-full h-full overflow-y-auto session-scroller"
+          style={{ "--session-title-height": props.showHeader ? "40px" : "0px" }}
+        >
+          <Show when={props.showHeader}>
+            <div
+              classList={{
+                "sticky top-0 z-30 bg-background-stronger": true,
+                "w-full": true,
+                "px-4 md:px-6": true,
+                "md:max-w-200 md:mx-auto 3xl:max-w-[1200px]": props.centered,
+              }}
+            >
+              <div class="h-10 w-full flex items-center justify-between gap-2">
+                <div class="flex items-center gap-1 min-w-0 flex-1">
+                  <Show when={props.parentID}>
+                    <IconButton
+                      tabIndex={-1}
+                      icon="arrow-left"
+                      variant="ghost"
+                      onClick={props.onNavigateParent}
+                      aria-label={props.t("common.goBack")}
+                    />
+                  </Show>
+                  <Show when={props.title || props.titleState.editing}>
+                    <Show
+                      when={props.titleState.editing}
+                      fallback={
+                        <h1 class="text-16-medium text-text-strong truncate min-w-0" onDblClick={props.openTitleEditor}>
+                          {props.title}
+                        </h1>
+                      }
+                    >
+                      <InlineInput
+                        ref={props.titleRef}
+                        value={props.titleState.draft}
+                        disabled={props.titleState.saving}
+                        class="text-16-medium text-text-strong grow-1 min-w-0"
+                        onInput={(event) => props.onTitleDraft(event.currentTarget.value)}
+                        onKeyDown={(event) => {
+                          event.stopPropagation()
+                          if (event.key === "Enter") {
+                            event.preventDefault()
+                            void props.saveTitleEditor()
+                            return
+                          }
+                          if (event.key === "Escape") {
+                            event.preventDefault()
+                            props.closeTitleEditor()
+                          }
+                        }}
+                        onBlur={props.closeTitleEditor}
+                      />
+                    </Show>
+                  </Show>
+                </div>
+                <Show when={props.sessionID}>
+                  {(id) => (
+                    <div class="shrink-0 flex items-center">
+                      <DropdownMenu open={props.titleState.menuOpen} onOpenChange={props.onTitleMenuOpen}>
+                        <Tooltip value={props.t("common.moreOptions")} placement="top">
+                          <DropdownMenu.Trigger
+                            as={IconButton}
+                            icon="dot-grid"
+                            variant="ghost"
+                            class="size-6 rounded-md data-[expanded]:bg-surface-base-active"
+                            aria-label={props.t("common.moreOptions")}
+                          />
+                        </Tooltip>
+                        <DropdownMenu.Portal>
+                          <DropdownMenu.Content
+                            onCloseAutoFocus={(event) => {
+                              if (!props.titleState.pendingRename) return
+                              event.preventDefault()
+                              props.onTitlePendingRename(false)
+                              props.openTitleEditor()
+                            }}
+                          >
+                            <DropdownMenu.Item
+                              onSelect={() => {
+                                props.onTitlePendingRename(true)
+                                props.onTitleMenuOpen(false)
+                              }}
+                            >
+                              <DropdownMenu.ItemLabel>{props.t("common.rename")}</DropdownMenu.ItemLabel>
+                            </DropdownMenu.Item>
+                            <DropdownMenu.Item onSelect={() => props.onArchiveSession(id())}>
+                              <DropdownMenu.ItemLabel>{props.t("common.archive")}</DropdownMenu.ItemLabel>
+                            </DropdownMenu.Item>
+                            <DropdownMenu.Separator />
+                            <DropdownMenu.Item onSelect={() => props.onDeleteSession(id())}>
+                              <DropdownMenu.ItemLabel>{props.t("common.delete")}</DropdownMenu.ItemLabel>
+                            </DropdownMenu.Item>
+                          </DropdownMenu.Content>
+                        </DropdownMenu.Portal>
+                      </DropdownMenu>
+                    </div>
+                  )}
+                </Show>
+              </div>
+            </div>
+          </Show>
+
+          <div
+            ref={props.setContentRef}
+            role="log"
+            class="flex flex-col gap-12 items-start justify-start pb-[calc(var(--prompt-height,8rem)+64px)] md:pb-[calc(var(--prompt-height,10rem)+64px)] transition-[margin]"
+            classList={{
+              "w-full": true,
+              "md:max-w-200 md:mx-auto 3xl:max-w-[1200px]": props.centered,
+              "mt-0.5": props.centered,
+              "mt-0": !props.centered,
+            }}
+          >
+            <Show when={props.turnStart > 0}>
+              <div class="w-full flex justify-center">
+                <Button variant="ghost" size="large" class="text-12-medium opacity-50" onClick={props.onRenderEarlier}>
+                  {props.t("session.messages.renderEarlier")}
+                </Button>
+              </div>
+            </Show>
+            <Show when={props.historyMore}>
+              <div class="w-full flex justify-center">
+                <Button
+                  variant="ghost"
+                  size="large"
+                  class="text-12-medium opacity-50"
+                  disabled={props.historyLoading}
+                  onClick={props.onLoadEarlier}
+                >
+                  {props.historyLoading
+                    ? props.t("session.messages.loadingEarlier")
+                    : props.t("session.messages.loadEarlier")}
+                </Button>
+              </div>
+            </Show>
+            <For each={props.renderedUserMessages}>
+              {(message) => {
+                if (import.meta.env.DEV && props.onFirstTurnMount) {
+                  onMount(() => props.onFirstTurnMount?.())
+                }
+
+                return (
+                  <div
+                    id={props.anchor(message.id)}
+                    data-message-id={message.id}
+                    ref={(el) => {
+                      props.onRegisterMessage(el, message.id)
+                      onCleanup(() => props.onUnregisterMessage(message.id))
+                    }}
+                    classList={{
+                      "min-w-0 w-full max-w-full": true,
+                      "md:max-w-200 3xl:max-w-[1200px]": props.centered,
+                    }}
+                  >
+                    <SessionTurn
+                      sessionID={props.sessionID}
+                      messageID={message.id}
+                      lastUserMessageID={props.lastUserMessageID}
+                      stepsExpanded={props.expanded[message.id] ?? false}
+                      onStepsExpandedToggle={() => props.onToggleExpanded(message.id)}
+                      classes={{
+                        root: "min-w-0 w-full relative",
+                        content: "flex flex-col justify-between !overflow-visible",
+                        container: "w-full px-4 md:px-6",
+                      }}
+                    />
+                  </div>
+                )
+              }}
+            </For>
+          </div>
+        </div>
+      </div>
+    </Show>
+  )
+}
diff --git a/packages/app/src/pages/session/review-tab.tsx b/packages/app/src/pages/session/review-tab.tsx
new file mode 100644
index 000000000..a4232dd74
--- /dev/null
+++ b/packages/app/src/pages/session/review-tab.tsx
@@ -0,0 +1,158 @@
+import { createEffect, on, onCleanup, createSignal, type JSX } from "solid-js"
+import type { FileDiff } from "@opencode-ai/sdk/v2"
+import { SessionReview } from "@opencode-ai/ui/session-review"
+import type { SelectedLineRange } from "@/context/file"
+import { useSDK } from "@/context/sdk"
+import { useLayout } from "@/context/layout"
+import type { LineComment } from "@/context/comments"
+
+export type DiffStyle = "unified" | "split"
+
+export interface SessionReviewTabProps {
+  title?: JSX.Element
+  empty?: JSX.Element
+  diffs: () => FileDiff[]
+  view: () => ReturnType<ReturnType<typeof useLayout>["view"]>
+  diffStyle: DiffStyle
+  onDiffStyleChange?: (style: DiffStyle) => void
+  onViewFile?: (file: string) => void
+  onLineComment?: (comment: { file: string; selection: SelectedLineRange; comment: string; preview?: string }) => void
+  comments?: LineComment[]
+  focusedComment?: { file: string; id: string } | null
+  onFocusedCommentChange?: (focus: { file: string; id: string } | null) => void
+  focusedFile?: string
+  onScrollRef?: (el: HTMLDivElement) => void
+  classes?: {
+    root?: string
+    header?: string
+    container?: string
+  }
+}
+
+export function StickyAddButton(props: { children: JSX.Element }) {
+  const [stuck, setStuck] = createSignal(false)
+  let button: HTMLDivElement | undefined
+
+  createEffect(() => {
+    const node = button
+    if (!node) return
+
+    const scroll = node.parentElement
+    if (!scroll) return
+
+    const handler = () => {
+      const rect = node.getBoundingClientRect()
+      const scrollRect = scroll.getBoundingClientRect()
+      setStuck(rect.right >= scrollRect.right && scroll.scrollWidth > scroll.clientWidth)
+    }
+
+    scroll.addEventListener("scroll", handler, { passive: true })
+    const observer = new ResizeObserver(handler)
+    observer.observe(scroll)
+    handler()
+    onCleanup(() => {
+      scroll.removeEventListener("scroll", handler)
+      observer.disconnect()
+    })
+  })
+
+  return (
+    <div
+      ref={button}
+      class="bg-background-base h-full shrink-0 sticky right-0 z-10 flex items-center justify-center border-b border-border-weak-base px-3"
+      classList={{ "border-l": stuck() }}
+    >
+      {props.children}
+    </div>
+  )
+}
+
+export function SessionReviewTab(props: SessionReviewTabProps) {
+  let scroll: HTMLDivElement | undefined
+  let frame: number | undefined
+  let pending: { x: number; y: number } | undefined
+
+  const sdk = useSDK()
+
+  const readFile = async (path: string) => {
+    return sdk.client.file
+      .read({ path })
+      .then((x) => x.data)
+      .catch(() => undefined)
+  }
+
+  const restoreScroll = () => {
+    const el = scroll
+    if (!el) return
+
+    const s = props.view().scroll("review")
+    if (!s) return
+
+    if (el.scrollTop !== s.y) el.scrollTop = s.y
+    if (el.scrollLeft !== s.x) el.scrollLeft = s.x
+  }
+
+  const handleScroll = (event: Event & { currentTarget: HTMLDivElement }) => {
+    pending = {
+      x: event.currentTarget.scrollLeft,
+      y: event.currentTarget.scrollTop,
+    }
+    if (frame !== undefined) return
+
+    frame = requestAnimationFrame(() => {
+      frame = undefined
+
+      const next = pending
+      pending = undefined
+      if (!next) return
+
+      props.view().setScroll("review", next)
+    })
+  }
+
+  createEffect(
+    on(
+      () => props.diffs().length,
+      () => {
+        requestAnimationFrame(restoreScroll)
+      },
+      { defer: true },
+    ),
+  )
+
+  onCleanup(() => {
+    if (frame === undefined) return
+    cancelAnimationFrame(frame)
+  })
+
+  return (
+    <SessionReview
+      title={props.title}
+      empty={props.empty}
+      scrollRef={(el) => {
+        scroll = el
+        props.onScrollRef?.(el)
+        restoreScroll()
+      }}
+      onScroll={handleScroll}
+      onDiffRendered={() => requestAnimationFrame(restoreScroll)}
+      open={props.view().review.open()}
+      onOpenChange={props.view().review.setOpen}
+      classes={{
+        root: props.classes?.root ?? "pb-40",
+        header: props.classes?.header ?? "px-6",
+        container: props.classes?.container ?? "px-6",
+      }}
+      diffs={props.diffs()}
+      diffStyle={props.diffStyle}
+      onDiffStyleChange={props.onDiffStyleChange}
+      onViewFile={props.onViewFile}
+      focusedFile={props.focusedFile}
+      readFile={readFile}
+      onLineComment={props.onLineComment}
+      comments={props.comments}
+      focusedComment={props.focusedComment}
+      onFocusedCommentChange={props.onFocusedCommentChange}
+    />
+  )
+}
diff --git a/packages/app/src/pages/session/session-command-helpers.ts b/packages/app/src/pages/session/session-command-helpers.ts
new file mode 100644
index 000000000..b71a7b768
--- /dev/null
+++ b/packages/app/src/pages/session/session-command-helpers.ts
@@ -0,0 +1,10 @@
+export const canAddSelectionContext = (input: {
+  active?: string
+  pathFromTab: (tab: string) => string | undefined
+  selectedLines: (path: string) => unknown
+}) => {
+  if (!input.active) return false
+  const path = input.pathFromTab(input.active)
+  if (!path) return false
+  return input.selectedLines(path) != null
+}
diff --git a/packages/app/src/pages/session/session-mobile-tabs.tsx b/packages/app/src/pages/session/session-mobile-tabs.tsx
new file mode 100644
index 000000000..41f058231
--- /dev/null
+++ b/packages/app/src/pages/session/session-mobile-tabs.tsx
@@ -0,0 +1,36 @@
+import { Match, Show, Switch } from "solid-js"
+import { Tabs } from "@opencode-ai/ui/tabs"
+
+export function SessionMobileTabs(props: {
+  open: boolean
+  hasReview: boolean
+  reviewCount: number
+  onSession: () => void
+  onChanges: () => void
+  t: (key: string, vars?: Record<string, string | number | boolean>) => string
+}) {
+  return (
+    <Show when={props.open}>
+      <Tabs class="h-auto">
+        <Tabs.List>
+          <Tabs.Trigger value="session" class="w-1/2" classes={{ button: "w-full" }} onClick={props.onSession}>
+            {props.t("session.tab.session")}
+          </Tabs.Trigger>
+          <Tabs.Trigger
+            value="changes"
+            class="w-1/2 !border-r-0"
+            classes={{ button: "w-full" }}
+            onClick={props.onChanges}
+          >
+            <Switch>
+              <Match when={props.hasReview}>
+                {props.t("session.review.filesChanged", { count: props.reviewCount })}
+              </Match>
+              <Match when={true}>{props.t("session.review.change.other")}</Match>
+            </Switch>
+          </Tabs.Trigger>
+        </Tabs.List>
+      </Tabs>
+    </Show>
+  )
+}
diff --git a/packages/app/src/pages/session/session-prompt-dock.test.ts b/packages/app/src/pages/session/session-prompt-dock.test.ts
new file mode 100644
index 000000000..b3a9945d6
--- /dev/null
+++ b/packages/app/src/pages/session/session-prompt-dock.test.ts
@@ -0,0 +1,22 @@
+import { describe, expect, test } from "bun:test"
+import { questionSubtitle } from "./session-prompt-helpers"
+
+describe("questionSubtitle", () => {
+  const t = (key: string) => {
+    if (key === "ui.common.question.one") return "question"
+    if (key === "ui.common.question.other") return "questions"
+    return key
+  }
+
+  test("returns empty for zero", () => {
+    expect(questionSubtitle(0, t)).toBe("")
+  })
+
+  test("uses singular label", () => {
+    expect(questionSubtitle(1, t)).toBe("1 question")
+  })
+
+  test("uses plural label", () => {
+    expect(questionSubtitle(3, t)).toBe("3 questions")
+  })
+})
diff --git a/packages/app/src/pages/session/session-prompt-dock.tsx b/packages/app/src/pages/session/session-prompt-dock.tsx
new file mode 100644
index 000000000..697957027
--- /dev/null
+++ b/packages/app/src/pages/session/session-prompt-dock.tsx
@@ -0,0 +1,137 @@
+import { For, Show, type ComponentProps } from "solid-js"
+import { Button } from "@opencode-ai/ui/button"
+import { BasicTool } from "@opencode-ai/ui/basic-tool"
+import { PromptInput } from "@/components/prompt-input"
+import { QuestionDock } from "@/components/question-dock"
+import { questionSubtitle } from "@/pages/session/session-prompt-helpers"
+
+const questionDockRequest = (value: unknown) => value as ComponentProps<typeof QuestionDock>["request"]
+
+export function SessionPromptDock(props: {
+  centered: boolean
+  questionRequest: () => { questions: unknown[] } | undefined
+  permissionRequest: () => { patterns: string[]; permission: string } | undefined
+  blocked: boolean
+  promptReady: boolean
+  handoffPrompt?: string
+  t: (key: string, vars?: Record<string, string | number | boolean>) => string
+  responding: boolean
+  onDecide: (response: "once" | "always" | "reject") => void
+  inputRef: (el: HTMLDivElement) => void
+  newSessionWorktree: string
+  onNewSessionWorktreeReset: () => void
+  onSubmit: () => void
+  setPromptDockRef: (el: HTMLDivElement) => void
+}) {
+  return (
+    <div
+      ref={props.setPromptDockRef}
+      class="absolute inset-x-0 bottom-0 pt-12 pb-4 flex flex-col justify-center items-center z-50 bg-gradient-to-t from-background-stronger via-background-stronger to-transparent pointer-events-none"
+    >
+      <div
+        classList={{
+          "w-full px-4 pointer-events-auto": true,
+          "md:max-w-200 md:mx-auto 3xl:max-w-[1200px]": props.centered,
+        }}
+      >
+        <Show when={props.questionRequest()} keyed>
+          {(req) => {
+            const subtitle = questionSubtitle(req.questions.length, (key) => props.t(key))
+            return (
+              <div data-component="tool-part-wrapper" data-question="true" class="mb-3">
+                <BasicTool
+                  icon="bubble-5"
+                  locked
+                  defaultOpen
+                  trigger={{
+                    title: props.t("ui.tool.questions"),
+                    subtitle,
+                  }}
+                />
+                <QuestionDock request={questionDockRequest(req)} />
+              </div>
+            )
+          }}
+        </Show>
+
+        <Show when={props.permissionRequest()} keyed>
+          {(perm) => (
+            <div data-component="tool-part-wrapper" data-permission="true" class="mb-3">
+              <BasicTool
+                icon="checklist"
+                locked
+                defaultOpen
+                trigger={{
+                  title: props.t("notification.permission.title"),
+                  subtitle:
+                    perm.permission === "doom_loop"
+                      ? props.t("settings.permissions.tool.doom_loop.title")
+                      : perm.permission,
+                }}
+              >
+                <Show when={perm.patterns.length > 0}>
+                  <div class="flex flex-col gap-1 py-2 px-3 max-h-40 overflow-y-auto no-scrollbar">
+                    <For each={perm.patterns}>
+                      {(pattern) => <code class="text-12-regular text-text-base break-all">{pattern}</code>}
+                    </For>
+                  </div>
+                </Show>
+                <Show when={perm.permission === "doom_loop"}>
+                  <div class="text-12-regular text-text-weak pb-2 px-3">
+                    {props.t("settings.permissions.tool.doom_loop.description")}
+                  </div>
+                </Show>
+              </BasicTool>
+              <div data-component="permission-prompt">
+                <div data-slot="permission-actions">
+                  <Button
+                    variant="ghost"
+                    size="small"
+                    onClick={() => props.onDecide("reject")}
+                    disabled={props.responding}
+                  >
+                    {props.t("ui.permission.deny")}
+                  </Button>
+                  <Button
+                    variant="secondary"
+                    size="small"
+                    onClick={() => props.onDecide("always")}
+                    disabled={props.responding}
+                  >
+                    {props.t("ui.permission.allowAlways")}
+                  </Button>
+                  <Button
+                    variant="primary"
+                    size="small"
+                    onClick={() => props.onDecide("once")}
+                    disabled={props.responding}
+                  >
+                    {props.t("ui.permission.allowOnce")}
+                  </Button>
+                </div>
+              </div>
+            </div>
+          )}
+        </Show>
+
+        <Show when={!props.blocked}>
+          <Show
+            when={props.promptReady}
+            fallback={
+              <div class="w-full min-h-32 md:min-h-40 rounded-md border border-border-weak-base bg-background-base/50 px-4 py-3 text-text-weak whitespace-pre-wrap pointer-events-none">
+                {props.handoffPrompt || props.t("prompt.loading")}
+              </div>
+            }
+          >
+            <PromptInput
+              ref={props.inputRef}
+              newSessionWorktree={props.newSessionWorktree}
+              onNewSessionWorktreeReset={props.onNewSessionWorktreeReset}
+              onSubmit={props.onSubmit}
+            />
+          </Show>
+        </Show>
+      </div>
+    </div>
+  )
+}
diff --git a/packages/app/src/pages/session/session-prompt-helpers.ts b/packages/app/src/pages/session/session-prompt-helpers.ts
new file mode 100644
index 000000000..ac3234c93
--- /dev/null
+++ b/packages/app/src/pages/session/session-prompt-helpers.ts
@@ -0,0 +1,4 @@
+export const questionSubtitle = (count: number, t: (key: string) => string) => {
+  if (count === 0) return ""
+  return `${count} ${t(count > 1 ? "ui.common.question.other" : "ui.common.question.one")}`
+}
diff --git a/packages/app/src/pages/session/session-side-panel.tsx b/packages/app/src/pages/session/session-side-panel.tsx
new file mode 100644
index 000000000..573680dec
--- /dev/null
+++ b/packages/app/src/pages/session/session-side-panel.tsx
@@ -0,0 +1,306 @@
+import { For, Match, Show, Switch, createMemo, onCleanup, type JSX, type ValidComponent } from "solid-js"
+import { Tabs } from "@opencode-ai/ui/tabs"
+import { IconButton } from "@opencode-ai/ui/icon-button"
+import { Tooltip, TooltipKeybind } from "@opencode-ai/ui/tooltip"
+import { ResizeHandle } from "@opencode-ai/ui/resize-handle"
+import { Mark } from "@opencode-ai/ui/logo"
+import FileTree from "@/components/file-tree"
+import { SessionContextUsage } from "@/components/session-context-usage"
+import { SessionContextTab, SortableTab, FileVisual } from "@/components/session"
+import { DialogSelectFile } from "@/components/dialog-select-file"
+import { createFileTabListSync } from "@/pages/session/file-tab-scroll"
+import { FileTabContent } from "@/pages/session/file-tabs"
+import { StickyAddButton } from "@/pages/session/review-tab"
+import { DragDropProvider, DragDropSensors, DragOverlay, SortableProvider, closestCenter } from "@thisbeyond/solid-dnd"
+import { ConstrainDragYAxis } from "@/utils/solid-dnd"
+import type { DragEvent } from "@thisbeyond/solid-dnd"
+import { useComments } from "@/context/comments"
+import { useCommand } from "@/context/command"
+import { useDialog } from "@opencode-ai/ui/context/dialog"
+import { useFile, type SelectedLineRange } from "@/context/file"
+import { useLanguage } from "@/context/language"
+import { useLayout } from "@/context/layout"
+import { useSync } from "@/context/sync"
+
+export function SessionSidePanel(props: {
+  open: boolean
+  language: ReturnType<typeof useLanguage>
+  layout: ReturnType<typeof useLayout>
+  command: ReturnType<typeof useCommand>
+  dialog: ReturnType<typeof useDialog>
+  file: ReturnType<typeof useFile>
+  comments: ReturnType<typeof useComments>
+  sync: ReturnType<typeof useSync>
+  hasReview: boolean
+  reviewCount: number
+  reviewTab: boolean
+  contextOpen: () => boolean
+  openedTabs: () => string[]
+  activeTab: () => string
+  activeFileTab: () => string | undefined
+  tabs: () => ReturnType<ReturnType<typeof useLayout>["tabs"]>
+  openTab: (value: string) => void
+  showAllFiles: () => void
+  reviewPanel: () => JSX.Element
+  messages: () => unknown[]
+  visibleUserMessages: () => unknown[]
+  view: () => ReturnType<ReturnType<typeof useLayout>["view"]>
+  info: () => unknown
+  handoffFiles: () => Record<string, SelectedLineRange | null> | undefined
+  codeComponent: NonNullable<ValidComponent>
+  addCommentToContext: (input: {
+    file: string
+    selection: SelectedLineRange
+    comment: string
+    preview?: string
+    origin?: "review" | "file"
+  }) => void
+  activeDraggable: () => string | undefined
+  onDragStart: (event: unknown) => void
+  onDragEnd: () => void
+  onDragOver: (event: DragEvent) => void
+  fileTreeTab: () => "changes" | "all"
+  setFileTreeTabValue: (value: string) => void
+  diffsReady: boolean
+  diffFiles: string[]
+  kinds: Map<string, "add" | "del" | "mix">
+  activeDiff?: string
+  focusReviewDiff: (path: string) => void
+}) {
+  return (
+    <Show when={props.open}>
+      <aside
+        id="review-panel"
+        aria-label={props.language.t("session.panel.reviewAndFiles")}
+        class="relative flex-1 min-w-0 h-full border-l border-border-weak-base flex"
+      >
+        <div class="flex-1 min-w-0 h-full">
+          <Show
+            when={props.layout.fileTree.opened() && props.fileTreeTab() === "changes"}
+            fallback={
+              <DragDropProvider
+                onDragStart={props.onDragStart}
+                onDragEnd={props.onDragEnd}
+                onDragOver={props.onDragOver}
+                collisionDetector={closestCenter}
+              >
+                <DragDropSensors />
+                <ConstrainDragYAxis />
+                <Tabs value={props.activeTab()} onChange={props.openTab}>
+                  <div class="sticky top-0 shrink-0 flex">
+                    <Tabs.List
+                      ref={(el: HTMLDivElement) => {
+                        const stop = createFileTabListSync({ el, contextOpen: props.contextOpen })
+                        onCleanup(stop)
+                      }}
+                    >
+                      <Show when={props.reviewTab}>
+                        <Tabs.Trigger value="review" classes={{ button: "!pl-6" }}>
+                          <div class="flex items-center gap-1.5">
+                            <div>{props.language.t("session.tab.review")}</div>
+                            <Show when={props.hasReview}>
+                              <div class="text-12-medium text-text-strong h-4 px-2 flex flex-col items-center justify-center rounded-full bg-surface-base">
+                                {props.reviewCount}
+                              </div>
+                            </Show>
+                          </div>
+                        </Tabs.Trigger>
+                      </Show>
+                      <Show when={props.contextOpen()}>
+                        <Tabs.Trigger
+                          value="context"
+                          closeButton={
+                            <Tooltip value={props.language.t("common.closeTab")} placement="bottom">
+                              <IconButton
+                                icon="close-small"
+                                variant="ghost"
+                                class="h-5 w-5"
+                                onClick={() => props.tabs().close("context")}
+                                aria-label={props.language.t("common.closeTab")}
+                              />
+                            </Tooltip>
+                          }
+                          hideCloseButton
+                          onMiddleClick={() => props.tabs().close("context")}
+                        >
+                          <div class="flex items-center gap-2">
+                            <SessionContextUsage variant="indicator" />
+                            <div>{props.language.t("session.tab.context")}</div>
+                          </div>
+                        </Tabs.Trigger>
+                      </Show>
+                      <SortableProvider ids={props.openedTabs()}>
+                        <For each={props.openedTabs()}>
+                          {(tab) => <SortableTab tab={tab} onTabClose={props.tabs().close} />}
+                        </For>
+                      </SortableProvider>
+                      <StickyAddButton>
+                        <TooltipKeybind
+                          title={props.language.t("command.file.open")}
+                          keybind={props.command.keybind("file.open")}
+                          class="flex items-center"
+                        >
+                          <IconButton
+                            icon="plus-small"
+                            variant="ghost"
+                            iconSize="large"
+                            onClick={() =>
+                              props.dialog.show(() => <DialogSelectFile mode="files" onOpenFile={props.showAllFiles} />)
+                            }
+                            aria-label={props.language.t("command.file.open")}
+                          />
+                        </TooltipKeybind>
+                      </StickyAddButton>
+                    </Tabs.List>
+                  </div>
+
+                  <Show when={props.reviewTab}>
+                    <Tabs.Content value="review" class="flex flex-col h-full overflow-hidden contain-strict">
+                      <Show when={props.activeTab() === "review"}>{props.reviewPanel()}</Show>
+                    </Tabs.Content>
+                  </Show>
+
+                  <Tabs.Content value="empty" class="flex flex-col h-full overflow-hidden contain-strict">
+                    <Show when={props.activeTab() === "empty"}>
+                      <div class="relative pt-2 flex-1 min-h-0 overflow-hidden">
+                        <div class="h-full px-6 pb-42 flex flex-col items-center justify-center text-center gap-6">
+                          <Mark class="w-14 opacity-10" />
+                          <div class="text-14-regular text-text-weak max-w-56">
+                            {props.language.t("session.files.selectToOpen")}
+                          </div>
+                        </div>
+                      </div>
+                    </Show>
+                  </Tabs.Content>
+
+                  <Show when={props.contextOpen()}>
+                    <Tabs.Content value="context" class="flex flex-col h-full overflow-hidden contain-strict">
+                      <Show when={props.activeTab() === "context"}>
+                        <div class="relative pt-2 flex-1 min-h-0 overflow-hidden">
+                          <SessionContextTab
+                            messages={props.messages as never}
+                            visibleUserMessages={props.visibleUserMessages as never}
+                            view={props.view as never}
+                            info={props.info as never}
+                          />
+                        </div>
+                      </Show>
+                    </Tabs.Content>
+                  </Show>
+
+                  <Show when={props.activeFileTab()} keyed>
+                    {(tab) => (
+                      <FileTabContent
+                        tab={tab}
+                        activeTab={props.activeTab}
+                        tabs={props.tabs}
+                        view={props.view}
+                        handoffFiles={props.handoffFiles}
+                        file={props.file}
+                        comments={props.comments}
+                        language={props.language}
+                        codeComponent={props.codeComponent}
+                        addCommentToContext={props.addCommentToContext}
+                      />
+                    )}
+                  </Show>
+                </Tabs>
+                <DragOverlay>
+                  <Show when={props.activeDraggable()}>
+                    {(tab) => {
+                      const path = createMemo(() => props.file.pathFromTab(tab()))
+                      return (
+                        <div class="relative px-6 h-12 flex items-center bg-background-stronger border-x border-border-weak-base border-b border-b-transparent">
+                          <Show when={path()}>{(p) => <FileVisual active path={p()} />}</Show>
+                        </div>
+                      )
+                    }}
+                  </Show>
+                </DragOverlay>
+              </DragDropProvider>
+            }
+          >
+            {props.reviewPanel()}
+          </Show>
+        </div>
+
+        <Show when={props.layout.fileTree.opened()}>
+          <div
+            id="file-tree-panel"
+            class="relative shrink-0 h-full"
+            style={{ width: `${props.layout.fileTree.width()}px` }}
+          >
+            <div class="h-full border-l border-border-weak-base flex flex-col overflow-hidden group/filetree">
+              <Tabs
+                variant="pill"
+                value={props.fileTreeTab()}
+                onChange={props.setFileTreeTabValue}
+                class="h-full"
+                data-scope="filetree"
+              >
+                <Tabs.List>
+                  <Tabs.Trigger value="changes" class="flex-1" classes={{ button: "w-full" }}>
+                    {props.reviewCount}{" "}
+                    {props.language.t(
+                      props.reviewCount === 1 ? "session.review.change.one" : "session.review.change.other",
+                    )}
+                  </Tabs.Trigger>
+                  <Tabs.Trigger value="all" class="flex-1" classes={{ button: "w-full" }}>
+                    {props.language.t("session.files.all")}
+                  </Tabs.Trigger>
+                </Tabs.List>
+                <Tabs.Content value="changes" class="bg-background-base px-3 py-0">
+                  <Switch>
+                    <Match when={props.hasReview}>
+                      <Show
+                        when={props.diffsReady}
+                        fallback={
+                          <div class="px-2 py-2 text-12-regular text-text-weak">
+                            {props.language.t("common.loading")}
+                            {props.language.t("common.loading.ellipsis")}
+                          </div>
+                        }
+                      >
+                        <FileTree
+                          path=""
+                          allowed={props.diffFiles}
+                          kinds={props.kinds}
+                          draggable={false}
+                          active={props.activeDiff}
+                          onFileClick={(node) => props.focusReviewDiff(node.path)}
+                        />
+                      </Show>
+                    </Match>
+                    <Match when={true}>
+                      <div class="mt-8 text-center text-12-regular text-text-weak">
+                        {props.language.t("session.review.noChanges")}
+                      </div>
+                    </Match>
+                  </Switch>
+                </Tabs.Content>
+                <Tabs.Content value="all" class="bg-background-base px-3 py-0">
+                  <FileTree
+                    path=""
+                    modified={props.diffFiles}
+                    kinds={props.kinds}
+                    onFileClick={(node) => props.openTab(props.file.tab(node.path))}
+                  />
+                </Tabs.Content>
+              </Tabs>
+            </div>
+            <ResizeHandle
+              direction="horizontal"
+              edge="start"
+              size={props.layout.fileTree.width()}
+              min={200}
+              max={480}
+              collapseThreshold={160}
+              onResize={props.layout.fileTree.resize}
+              onCollapse={props.layout.fileTree.close}
+            />
+          </div>
+        </Show>
+      </aside>
+    </Show>
+  )
+}
diff --git a/packages/app/src/pages/session/terminal-label.ts b/packages/app/src/pages/session/terminal-label.ts
new file mode 100644
index 000000000..6d336769b
--- /dev/null
+++ b/packages/app/src/pages/session/terminal-label.ts
@@ -0,0 +1,16 @@
+export const terminalTabLabel = (input: {
+  title?: string
+  titleNumber?: number
+  t: (key: string, vars?: Record<string, string | number | boolean>) => string
+}) => {
+  const title = input.title ?? ""
+  const number = input.titleNumber ?? 0
+  const match = title.match(/^Terminal (\d+)$/)
+  const parsed = match ? Number(match[1]) : undefined
+  const isDefaultTitle = Number.isFinite(number) && number > 0 && Number.isFinite(parsed) && parsed === number
+
+  if (title && !isDefaultTitle) return title
+  if (number > 0) return input.t("terminal.title.numbered", { number })
+  if (title) return title
+  return input.t("terminal.title")
+}
diff --git a/packages/app/src/pages/session/terminal-panel.test.ts b/packages/app/src/pages/session/terminal-panel.test.ts
new file mode 100644
index 000000000..43eeec32f
--- /dev/null
+++ b/packages/app/src/pages/session/terminal-panel.test.ts
@@ -0,0 +1,25 @@
+import { describe, expect, test } from "bun:test"
+import { terminalTabLabel } from "./terminal-label"
+
+const t = (key: string, vars?: Record<string, string | number | boolean>) => {
+  if (key === "terminal.title.numbered") return `Terminal ${vars?.number}`
+  if (key === "terminal.title") return "Terminal"
+  return key
+}
+
+describe("terminalTabLabel", () => {
+  test("returns custom title unchanged", () => {
+    const label = terminalTabLabel({ title: "server", titleNumber: 3, t })
+    expect(label).toBe("server")
+  })
+
+  test("normalizes default numbered title", () => {
+    const label = terminalTabLabel({ title: "Terminal 2", titleNumber: 2, t })
+    expect(label).toBe("Terminal 2")
+  })
+
+  test("falls back to generic title", () => {
+    const label = terminalTabLabel({ title: "", titleNumber: 0, t })
+    expect(label).toBe("Terminal")
+  })
+})
diff --git a/packages/app/src/pages/session/terminal-panel.tsx b/packages/app/src/pages/session/terminal-panel.tsx
new file mode 100644
index 000000000..09095d689
--- /dev/null
+++ b/packages/app/src/pages/session/terminal-panel.tsx
@@ -0,0 +1,169 @@
+import { createMemo, For, Show } from "solid-js"
+import { Tabs } from "@opencode-ai/ui/tabs"
+import { ResizeHandle } from "@opencode-ai/ui/resize-handle"
+import { IconButton } from "@opencode-ai/ui/icon-button"
+import { TooltipKeybind } from "@opencode-ai/ui/tooltip"
+import { DragDropProvider, DragDropSensors, DragOverlay, SortableProvider, closestCenter } from "@thisbeyond/solid-dnd"
+import type { DragEvent } from "@thisbeyond/solid-dnd"
+import { ConstrainDragYAxis } from "@/utils/solid-dnd"
+import { SortableTerminalTab } from "@/components/session"
+import { Terminal } from "@/components/terminal"
+import { useTerminal, type LocalPTY } from "@/context/terminal"
+import { useLanguage } from "@/context/language"
+import { useCommand } from "@/context/command"
+import { terminalTabLabel } from "@/pages/session/terminal-label"
+
+export function TerminalPanel(props: {
+  open: boolean
+  height: number
+  resize: (value: number) => void
+  close: () => void
+  terminal: ReturnType<typeof useTerminal>
+  language: ReturnType<typeof useLanguage>
+  command: ReturnType<typeof useCommand>
+  handoff: () => string[]
+  activeTerminalDraggable: () => string | undefined
+  handleTerminalDragStart: (event: unknown) => void
+  handleTerminalDragOver: (event: DragEvent) => void
+  handleTerminalDragEnd: () => void
+  onCloseTab: () => void
+}) {
+  return (
+    <Show when={props.open}>
+      <div
+        id="terminal-panel"
+        role="region"
+        aria-label={props.language.t("terminal.title")}
+        class="relative w-full flex flex-col shrink-0 border-t border-border-weak-base"
+        style={{ height: `${props.height}px` }}
+      >
+        <ResizeHandle
+          direction="vertical"
+          size={props.height}
+          min={100}
+          max={window.innerHeight * 0.6}
+          collapseThreshold={50}
+          onResize={props.resize}
+          onCollapse={props.close}
+        />
+        <Show
+          when={props.terminal.ready()}
+          fallback={
+            <div class="flex flex-col h-full pointer-events-none">
+              <div class="h-10 flex items-center gap-2 px-2 border-b border-border-weak-base bg-background-stronger overflow-hidden">
+                <For each={props.handoff()}>
+                  {(title) => (
+                    <div class="px-2 py-1 rounded-md bg-surface-base text-14-regular text-text-weak truncate max-w-40">
+                      {title}
+                    </div>
+                  )}
+                </For>
+                <div class="flex-1" />
+                <div class="text-text-weak pr-2">
+                  {props.language.t("common.loading")}
+                  {props.language.t("common.loading.ellipsis")}
+                </div>
+              </div>
+              <div class="flex-1 flex items-center justify-center text-text-weak">
+                {props.language.t("terminal.loading")}
+              </div>
+            </div>
+          }
+        >
+          <DragDropProvider
+            onDragStart={props.handleTerminalDragStart}
+            onDragEnd={props.handleTerminalDragEnd}
+            onDragOver={props.handleTerminalDragOver}
+            collisionDetector={closestCenter}
+          >
+            <DragDropSensors />
+            <ConstrainDragYAxis />
+            <div class="flex flex-col h-full">
+              <Tabs
+                variant="alt"
+                value={props.terminal.active()}
+                onChange={(id) => props.terminal.open(id)}
+                class="!h-auto !flex-none"
+              >
+                <Tabs.List class="h-10">
+                  <SortableProvider ids={props.terminal.all().map((t: LocalPTY) => t.id)}>
+                    <For each={props.terminal.all()}>
+                      {(pty) => (
+                        <SortableTerminalTab
+                          terminal={pty}
+                          onClose={() => {
+                            props.close()
+                            props.onCloseTab()
+                          }}
+                        />
+                      )}
+                    </For>
+                  </SortableProvider>
+                  <div class="h-full flex items-center justify-center">
+                    <TooltipKeybind
+                      title={props.language.t("command.terminal.new")}
+                      keybind={props.command.keybind("terminal.new")}
+                      class="flex items-center"
+                    >
+                      <IconButton
+                        icon="plus-small"
+                        variant="ghost"
+                        iconSize="large"
+                        onClick={props.terminal.new}
+                        aria-label={props.language.t("command.terminal.new")}
+                      />
+                    </TooltipKeybind>
+                  </div>
+                </Tabs.List>
+              </Tabs>
+              <div class="flex-1 min-h-0 relative">
+                <For each={props.terminal.all()}>
+                  {(pty) => (
+                    <div
+                      id={`terminal-wrapper-${pty.id}`}
+                      class="absolute inset-0"
+                      style={{
+                        display: props.terminal.active() === pty.id ? "block" : "none",
+                      }}
+                    >
+                      <Show when={pty.id} keyed>
+                        <Terminal
+                          pty={pty}
+                          onCleanup={props.terminal.update}
+                          onConnectError={() => props.terminal.clone(pty.id)}
+                        />
+                      </Show>
+                    </div>
+                  )}
+                </For>
+              </div>
+            </div>
+            <DragOverlay>
+              <Show when={props.activeTerminalDraggable()}>
+                {(draggedId) => {
+                  const pty = createMemo(() => props.terminal.all().find((t: LocalPTY) => t.id === draggedId()))
+                  return (
+                    <Show when={pty()}>
+                      {(t) => (
+                        <div class="relative p-1 h-10 flex items-center bg-background-stronger text-14-regular">
+                          {terminalTabLabel({
+                            title: t().title,
+                            titleNumber: t().titleNumber,
+                            t: props.language.t as (
+                              key: string,
+                              vars?: Record<string, string | number | boolean>,
+                            ) => string,
+                          })}
+                        </div>
+                      )}
+                    </Show>
+                  )
+                }}
+              </Show>
+            </DragOverlay>
+          </DragDropProvider>
+        </Show>
+      </div>
+    </Show>
+  )
+}
diff --git a/packages/app/src/pages/session/use-session-commands.test.ts b/packages/app/src/pages/session/use-session-commands.test.ts
new file mode 100644
index 000000000..ada1871e1
--- /dev/null
+++ b/packages/app/src/pages/session/use-session-commands.test.ts
@@ -0,0 +1,44 @@
+import { describe, expect, test } from "bun:test"
+import { canAddSelectionContext } from "./session-command-helpers"
+
+describe("canAddSelectionContext", () => {
+  test("returns false without active tab", () => {
+    expect(
+      canAddSelectionContext({
+        active: undefined,
+        pathFromTab: () => "src/a.ts",
+        selectedLines: () => ({ start: 1, end: 1 }),
+      }),
+    ).toBe(false)
+  })
+
+  test("returns false when active tab is not a file", () => {
+    expect(
+      canAddSelectionContext({
+        active: "context",
+        pathFromTab: () => undefined,
+        selectedLines: () => ({ start: 1, end: 1 }),
+      }),
+    ).toBe(false)
+  })
+
+  test("returns false without selected lines", () => {
+    expect(
+      canAddSelectionContext({
+        active: "file://src/a.ts",
+        pathFromTab: () => "src/a.ts",
+        selectedLines: () => null,
+      }),
+    ).toBe(false)
+  })
+
+  test("returns true when file and selection exist", () => {
+    expect(
+      canAddSelectionContext({
+        active: "file://src/a.ts",
+        pathFromTab: () => "src/a.ts",
+        selectedLines: () => ({ start: 1, end: 2 }),
+      }),
+    ).toBe(true)
+  })
+})
diff --git a/packages/app/src/pages/session/use-session-commands.tsx b/packages/app/src/pages/session/use-session-commands.tsx
new file mode 100644
index 000000000..ae845a657
--- /dev/null
+++ b/packages/app/src/pages/session/use-session-commands.tsx
@@ -0,0 +1,439 @@
+import { createMemo } from "solid-js"
+import { useNavigate, useParams } from "@solidjs/router"
+import { useCommand } from "@/context/command"
+import { useDialog } from "@opencode-ai/ui/context/dialog"
+import { useFile, selectionFromLines, type FileSelection } from "@/context/file"
+import { useLanguage } from "@/context/language"
+import { useLayout } from "@/context/layout"
+import { useLocal } from "@/context/local"
+import { usePermission } from "@/context/permission"
+import { usePrompt } from "@/context/prompt"
+import { useSDK } from "@/context/sdk"
+import { useSync } from "@/context/sync"
+import { useTerminal } from "@/context/terminal"
+import { DialogSelectFile } from "@/components/dialog-select-file"
+import { DialogSelectModel } from "@/components/dialog-select-model"
+import { DialogSelectMcp } from "@/components/dialog-select-mcp"
+import { DialogFork } from "@/components/dialog-fork"
+import { showToast } from "@opencode-ai/ui/toast"
+import { findLast } from "@opencode-ai/util/array"
+import { extractPromptFromParts } from "@/utils/prompt"
+import { UserMessage } from "@opencode-ai/sdk/v2"
+import { combineCommandSections } from "@/pages/session/helpers"
+import { canAddSelectionContext } from "@/pages/session/session-command-helpers"
+
+export const useSessionCommands = (input: {
+  command: ReturnType<typeof useCommand>
+  dialog: ReturnType<typeof useDialog>
+  file: ReturnType<typeof useFile>
+  language: ReturnType<typeof useLanguage>
+  local: ReturnType<typeof useLocal>
+  permission: ReturnType<typeof usePermission>
+  prompt: ReturnType<typeof usePrompt>
+  sdk: ReturnType<typeof useSDK>
+  sync: ReturnType<typeof useSync>
+  terminal: ReturnType<typeof useTerminal>
+  layout: ReturnType<typeof useLayout>
+  params: ReturnType<typeof useParams>
+  navigate: ReturnType<typeof useNavigate>
+  tabs: () => ReturnType<ReturnType<typeof useLayout>["tabs"]>
+  view: () => ReturnType<ReturnType<typeof useLayout>["view"]>
+  info: () => { revert?: { messageID?: string }; share?: { url?: string } } | undefined
+  status: () => { type: string }
+  userMessages: () => UserMessage[]
+  visibleUserMessages: () => UserMessage[]
+  activeMessage: () => UserMessage | undefined
+  showAllFiles: () => void
+  navigateMessageByOffset: (offset: number) => void
+  setExpanded: (id: string, fn: (open: boolean | undefined) => boolean) => void
+  setActiveMessage: (message: UserMessage | undefined) => void
+  addSelectionToContext: (path: string, selection: FileSelection) => void
+}) => {
+  const sessionCommands = createMemo(() => [
+    {
+      id: "session.new",
+      title: input.language.t("command.session.new"),
+      category: input.language.t("command.category.session"),
+      keybind: "mod+shift+s",
+      slash: "new",
+      onSelect: () => input.navigate(`/${input.params.dir}/session`),
+    },
+  ])
+
+  const fileCommands = createMemo(() => [
+    {
+      id: "file.open",
+      title: input.language.t("command.file.open"),
+      description: input.language.t("palette.search.placeholder"),
+      category: input.language.t("command.category.file"),
+      keybind: "mod+p",
+      slash: "open",
+      onSelect: () => input.dialog.show(() => <DialogSelectFile onOpenFile={input.showAllFiles} />),
+    },
+    {
+      id: "tab.close",
+      title: input.language.t("command.tab.close"),
+      category: input.language.t("command.category.file"),
+      keybind: "mod+w",
+      disabled: !input.tabs().active(),
+      onSelect: () => {
+        const active = input.tabs().active()
+        if (!active) return
+        input.tabs().close(active)
+      },
+    },
+  ])
+
+  const contextCommands = createMemo(() => [
+    {
+      id: "context.addSelection",
+      title: input.language.t("command.context.addSelection"),
+      description: input.language.t("command.context.addSelection.description"),
+      category: input.language.t("command.category.context"),
+      keybind: "mod+shift+l",
+      disabled: !canAddSelectionContext({
+        active: input.tabs().active(),
+        pathFromTab: input.file.pathFromTab,
+        selectedLines: input.file.selectedLines,
+      }),
+      onSelect: () => {
+        const active = input.tabs().active()
+        if (!active) return
+        const path = input.file.pathFromTab(active)
+        if (!path) return
+
+        const range = input.file.selectedLines(path)
+        if (!range) {
+          showToast({
+            title: input.language.t("toast.context.noLineSelection.title"),
+            description: input.language.t("toast.context.noLineSelection.description"),
+          })
+          return
+        }
+
+        input.addSelectionToContext(path, selectionFromLines(range))
+      },
+    },
+  ])
+
+  const viewCommands = createMemo(() => [
+    {
+      id: "terminal.toggle",
+      title: input.language.t("command.terminal.toggle"),
+      description: "",
+      category: input.language.t("command.category.view"),
+      keybind: "ctrl+`",
+      slash: "terminal",
+      onSelect: () => input.view().terminal.toggle(),
+    },
+    {
+      id: "review.toggle",
+      title: input.language.t("command.review.toggle"),
+      description: "",
+      category: input.language.t("command.category.view"),
+      keybind: "mod+shift+r",
+      onSelect: () => input.view().reviewPanel.toggle(),
+    },
+    {
+      id: "fileTree.toggle",
+      title: input.language.t("command.fileTree.toggle"),
+      description: "",
+      category: input.language.t("command.category.view"),
+      onSelect: () => {
+        const opening = !input.layout.fileTree.opened()
+        if (opening && !input.view().reviewPanel.opened()) input.view().reviewPanel.open()
+        input.layout.fileTree.toggle()
+      },
+    },
+    {
+      id: "terminal.new",
+      title: input.language.t("command.terminal.new"),
+      description: input.language.t("command.terminal.new.description"),
+      category: input.language.t("command.category.terminal"),
+      keybind: "ctrl+alt+t",
+      onSelect: () => {
+        if (input.terminal.all().length > 0) input.terminal.new()
+        input.view().terminal.open()
+      },
+    },
+    {
+      id: "steps.toggle",
+      title: input.language.t("command.steps.toggle"),
+      description: input.language.t("command.steps.toggle.description"),
+      category: input.language.t("command.category.view"),
+      keybind: "mod+e",
+      slash: "steps",
+      disabled: !input.params.id,
+      onSelect: () => {
+        const msg = input.activeMessage()
+        if (!msg) return
+        input.setExpanded(msg.id, (open: boolean | undefined) => !open)
+      },
+    },
+  ])
+
+  const messageCommands = createMemo(() => [
+    {
+      id: "message.previous",
+      title: input.language.t("command.message.previous"),
+      description: input.language.t("command.message.previous.description"),
+      category: input.language.t("command.category.session"),
+      keybind: "mod+arrowup",
+      disabled: !input.params.id,
+      onSelect: () => input.navigateMessageByOffset(-1),
+    },
+    {
+      id: "message.next",
+      title: input.language.t("command.message.next"),
+      description: input.language.t("command.message.next.description"),
+      category: input.language.t("command.category.session"),
+      keybind: "mod+arrowdown",
+      disabled: !input.params.id,
+      onSelect: () => input.navigateMessageByOffset(1),
+    },
+  ])
+
+  const agentCommands = createMemo(() => [
+    {
+      id: "model.choose",
+      title: input.language.t("command.model.choose"),
+      description: input.language.t("command.model.choose.description"),
+      category: input.language.t("command.category.model"),
+      keybind: "mod+'",
+      slash: "model",
+      onSelect: () => input.dialog.show(() => <DialogSelectModel />),
+    },
+    {
+      id: "mcp.toggle",
+      title: input.language.t("command.mcp.toggle"),
+      description: input.language.t("command.mcp.toggle.description"),
+      category: input.language.t("command.category.mcp"),
+      keybind: "mod+;",
+      slash: "mcp",
+      onSelect: () => input.dialog.show(() => <DialogSelectMcp />),
+    },
+    {
+      id: "agent.cycle",
+      title: input.language.t("command.agent.cycle"),
+      description: input.language.t("command.agent.cycle.description"),
+      category: input.language.t("command.category.agent"),
+      keybind: "mod+.",
+      slash: "agent",
+      onSelect: () => input.local.agent.move(1),
+    },
+    {
+      id: "agent.cycle.reverse",
+      title: input.language.t("command.agent.cycle.reverse"),
+      description: input.language.t("command.agent.cycle.reverse.description"),
+      category: input.language.t("command.category.agent"),
+      keybind: "shift+mod+.",
+      onSelect: () => input.local.agent.move(-1),
+    },
+    {
+      id: "model.variant.cycle",
+      title: input.language.t("command.model.variant.cycle"),
+      description: input.language.t("command.model.variant.cycle.description"),
+      category: input.language.t("command.category.model"),
+      keybind: "shift+mod+d",
+      onSelect: () => {
+        input.local.model.variant.cycle()
+      },
+    },
+  ])
+
+  const permissionCommands = createMemo(() => [
+    {
+      id: "permissions.autoaccept",
+      title:
+        input.params.id && input.permission.isAutoAccepting(input.params.id, input.sdk.directory)
+          ? input.language.t("command.permissions.autoaccept.disable")
+          : input.language.t("command.permissions.autoaccept.enable"),
+      category: input.language.t("command.category.permissions"),
+      keybind: "mod+shift+a",
+      disabled: !input.params.id || !input.permission.permissionsEnabled(),
+      onSelect: () => {
+        const sessionID = input.params.id
+        if (!sessionID) return
+        input.permission.toggleAutoAccept(sessionID, input.sdk.directory)
+        showToast({
+          title: input.permission.isAutoAccepting(sessionID, input.sdk.directory)
+            ? input.language.t("toast.permissions.autoaccept.on.title")
+            : input.language.t("toast.permissions.autoaccept.off.title"),
+          description: input.permission.isAutoAccepting(sessionID, input.sdk.directory)
+            ? input.language.t("toast.permissions.autoaccept.on.description")
+            : input.language.t("toast.permissions.autoaccept.off.description"),
+        })
+      },
+    },
+  ])
+
+  const sessionActionCommands = createMemo(() => [
+    {
+      id: "session.undo",
+      title: input.language.t("command.session.undo"),
+      description: input.language.t("command.session.undo.description"),
+      category: input.language.t("command.category.session"),
+      slash: "undo",
+      disabled: !input.params.id || input.visibleUserMessages().length === 0,
+      onSelect: async () => {
+        const sessionID = input.params.id
+        if (!sessionID) return
+        if (input.status()?.type !== "idle") {
+          await input.sdk.client.session.abort({ sessionID }).catch(() => {})
+        }
+        const revert = input.info()?.revert?.messageID
+        const message = findLast(input.userMessages(), (x) => !revert || x.id < revert)
+        if (!message) return
+        await input.sdk.client.session.revert({ sessionID, messageID: message.id })
+        const parts = input.sync.data.part[message.id]
+        if (parts) {
+          const restored = extractPromptFromParts(parts, { directory: input.sdk.directory })
+          input.prompt.set(restored)
+        }
+        const priorMessage = findLast(input.userMessages(), (x) => x.id < message.id)
+        input.setActiveMessage(priorMessage)
+      },
+    },
+    {
+      id: "session.redo",
+      title: input.language.t("command.session.redo"),
+      description: input.language.t("command.session.redo.description"),
+      category: input.language.t("command.category.session"),
+      slash: "redo",
+      disabled: !input.params.id || !input.info()?.revert?.messageID,
+      onSelect: async () => {
+        const sessionID = input.params.id
+        if (!sessionID) return
+        const revertMessageID = input.info()?.revert?.messageID
+        if (!revertMessageID) return
+        const nextMessage = input.userMessages().find((x) => x.id > revertMessageID)
+        if (!nextMessage) {
+          await input.sdk.client.session.unrevert({ sessionID })
+          input.prompt.reset()
+          const lastMsg = findLast(input.userMessages(), (x) => x.id >= revertMessageID)
+          input.setActiveMessage(lastMsg)
+          return
+        }
+        await input.sdk.client.session.revert({ sessionID, messageID: nextMessage.id })
+        const priorMsg = findLast(input.userMessages(), (x) => x.id < nextMessage.id)
+        input.setActiveMessage(priorMsg)
+      },
+    },
+    {
+      id: "session.compact",
+      title: input.language.t("command.session.compact"),
+      description: input.language.t("command.session.compact.description"),
+      category: input.language.t("command.category.session"),
+      slash: "compact",
+      disabled: !input.params.id || input.visibleUserMessages().length === 0,
+      onSelect: async () => {
+        const sessionID = input.params.id
+        if (!sessionID) return
+        const model = input.local.model.current()
+        if (!model) {
+          showToast({
+            title: input.language.t("toast.model.none.title"),
+            description: input.language.t("toast.model.none.description"),
+          })
+          return
+        }
+        await input.sdk.client.session.summarize({
+          sessionID,
+          modelID: model.id,
+          providerID: model.provider.id,
+        })
+      },
+    },
+    {
+      id: "session.fork",
+      title: input.language.t("command.session.fork"),
+      description: input.language.t("command.session.fork.description"),
+      category: input.language.t("command.category.session"),
+      slash: "fork",
+      disabled: !input.params.id || input.visibleUserMessages().length === 0,
+      onSelect: () => input.dialog.show(() => <DialogFork />),
+    },
+  ])
+
+  const shareCommands = createMemo(() => {
+    if (input.sync.data.config.share === "disabled") return []
+    return [
+      {
+        id: "session.share",
+        title: input.language.t("command.session.share"),
+        description: input.language.t("command.session.share.description"),
+        category: input.language.t("command.category.session"),
+        slash: "share",
+        disabled: !input.params.id || !!input.info()?.share?.url,
+        onSelect: async () => {
+          if (!input.params.id) return
+          await input.sdk.client.session
+            .share({ sessionID: input.params.id })
+            .then((res) => {
+              navigator.clipboard.writeText(res.data!.share!.url).catch(() =>
+                showToast({
+                  title: input.language.t("toast.session.share.copyFailed.title"),
+                  variant: "error",
+                }),
+              )
+            })
+            .then(() =>
+              showToast({
+                title: input.language.t("toast.session.share.success.title"),
+                description: input.language.t("toast.session.share.success.description"),
+                variant: "success",
+              }),
+            )
+            .catch(() =>
+              showToast({
+                title: input.language.t("toast.session.share.failed.title"),
+                description: input.language.t("toast.session.share.failed.description"),
+                variant: "error",
+              }),
+            )
+        },
+      },
+      {
+        id: "session.unshare",
+        title: input.language.t("command.session.unshare"),
+        description: input.language.t("command.session.unshare.description"),
+        category: input.language.t("command.category.session"),
+        slash: "unshare",
+        disabled: !input.params.id || !input.info()?.share?.url,
+        onSelect: async () => {
+          if (!input.params.id) return
+          await input.sdk.client.session
+            .unshare({ sessionID: input.params.id })
+            .then(() =>
+              showToast({
+                title: input.language.t("toast.session.unshare.success.title"),
+                description: input.language.t("toast.session.unshare.success.description"),
+                variant: "success",
+              }),
+            )
+            .catch(() =>
+              showToast({
+                title: input.language.t("toast.session.unshare.failed.title"),
+                description: input.language.t("toast.session.unshare.failed.description"),
+                variant: "error",
+              }),
+            )
+        },
+      },
+    ]
+  })
+
+  input.command.register("session", () =>
+    combineCommandSections([
+      sessionCommands(),
+      fileCommands(),
+      contextCommands(),
+      viewCommands(),
+      messageCommands(),
+      agentCommands(),
+      permissionCommands(),
+      sessionActionCommands(),
+      shareCommands(),
+    ]),
+  )
+}
diff --git a/packages/app/src/pages/session/use-session-hash-scroll.test.ts b/packages/app/src/pages/session/use-session-hash-scroll.test.ts
new file mode 100644
index 000000000..844f5451e
--- /dev/null
+++ b/packages/app/src/pages/session/use-session-hash-scroll.test.ts
@@ -0,0 +1,16 @@
+import { describe, expect, test } from "bun:test"
+import { messageIdFromHash } from "./use-session-hash-scroll"
+
+describe("messageIdFromHash", () => {
+  test("parses hash with leading #", () => {
+    expect(messageIdFromHash("#message-abc123")).toBe("abc123")
+  })
+
+  test("parses raw hash fragment", () => {
+    expect(messageIdFromHash("message-42")).toBe("42")
+  })
+
+  test("ignores non-message anchors", () => {
+    expect(messageIdFromHash("#review-panel")).toBeUndefined()
+  })
+})
diff --git a/packages/app/src/pages/session/use-session-hash-scroll.ts b/packages/app/src/pages/session/use-session-hash-scroll.ts
new file mode 100644
index 000000000..8952bbd98
--- /dev/null
+++ b/packages/app/src/pages/session/use-session-hash-scroll.ts
@@ -0,0 +1,174 @@
+import { createEffect, on, onCleanup } from "solid-js"
+import { UserMessage } from "@opencode-ai/sdk/v2"
+
+export const messageIdFromHash = (hash: string) => {
+  const value = hash.startsWith("#") ? hash.slice(1) : hash
+  const match = value.match(/^message-(.+)$/)
+  if (!match) return
+  return match[1]
+}
+
+export const useSessionHashScroll = (input: {
+  sessionKey: () => string
+  sessionID: () => string | undefined
+  messagesReady: () => boolean
+  visibleUserMessages: () => UserMessage[]
+  turnStart: () => number
+  currentMessageId: () => string | undefined
+  pendingMessage: () => string | undefined
+  setPendingMessage: (value: string | undefined) => void
+  setActiveMessage: (message: UserMessage | undefined) => void
+  setTurnStart: (value: number) => void
+  scheduleTurnBackfill: () => void
+  autoScroll: { pause: () => void; forceScrollToBottom: () => void }
+  scroller: () => HTMLDivElement | undefined
+  anchor: (id: string) => string
+  scheduleScrollState: (el: HTMLDivElement) => void
+  consumePendingMessage: (key: string) => string | undefined
+}) => {
+  const clearMessageHash = () => {
+    if (!window.location.hash) return
+    window.history.replaceState(null, "", window.location.href.replace(/#.*$/, ""))
+  }
+
+  const updateHash = (id: string) => {
+    window.history.replaceState(null, "", `#${input.anchor(id)}`)
+  }
+
+  const scrollToElement = (el: HTMLElement, behavior: ScrollBehavior) => {
+    const root = input.scroller()
+    if (!root) return false
+
+    const a = el.getBoundingClientRect()
+    const b = root.getBoundingClientRect()
+    const top = a.top - b.top + root.scrollTop
+    root.scrollTo({ top, behavior })
+    return true
+  }
+
+  const scrollToMessage = (message: UserMessage, behavior: ScrollBehavior = "smooth") => {
+    input.setActiveMessage(message)
+
+    const msgs = input.visibleUserMessages()
+    const index = msgs.findIndex((m) => m.id === message.id)
+    if (index !== -1 && index < input.turnStart()) {
+      input.setTurnStart(index)
+      input.scheduleTurnBackfill()
+
+      requestAnimationFrame(() => {
+        const el = document.getElementById(input.anchor(message.id))
+        if (!el) {
+          requestAnimationFrame(() => {
+            const next = document.getElementById(input.anchor(message.id))
+            if (!next) return
+            scrollToElement(next, behavior)
+          })
+          return
+        }
+        scrollToElement(el, behavior)
+      })
+
+      updateHash(message.id)
+      return
+    }
+
+    const el = document.getElementById(input.anchor(message.id))
+    if (!el) {
+      updateHash(message.id)
+      requestAnimationFrame(() => {
+        const next = document.getElementById(input.anchor(message.id))
+        if (!next) return
+        if (!scrollToElement(next, behavior)) return
+      })
+      return
+    }
+    if (scrollToElement(el, behavior)) {
+      updateHash(message.id)
+      return
+    }
+
+    requestAnimationFrame(() => {
+      const next = document.getElementById(input.anchor(message.id))
+      if (!next) return
+      if (!scrollToElement(next, behavior)) return
+    })
+    updateHash(message.id)
+  }
+
+  const applyHash = (behavior: ScrollBehavior) => {
+    const hash = window.location.hash.slice(1)
+    if (!hash) {
+      input.autoScroll.forceScrollToBottom()
+      const el = input.scroller()
+      if (el) input.scheduleScrollState(el)
+      return
+    }
+
+    const messageId = messageIdFromHash(hash)
+    if (messageId) {
+      input.autoScroll.pause()
+      const msg = input.visibleUserMessages().find((m) => m.id === messageId)
+      if (msg) {
+        scrollToMessage(msg, behavior)
+        return
+      }
+      return
+    }
+
+    const target = document.getElementById(hash)
+    if (target) {
+      input.autoScroll.pause()
+      scrollToElement(target, behavior)
+      return
+    }
+
+    input.autoScroll.forceScrollToBottom()
+    const el = input.scroller()
+    if (el) input.scheduleScrollState(el)
+  }
+
+  createEffect(
+    on(input.sessionKey, (key) => {
+      if (!input.sessionID()) return
+      const messageID = input.consumePendingMessage(key)
+      if (!messageID) return
+      input.setPendingMessage(messageID)
+    }),
+  )
+
+  createEffect(() => {
+    if (!input.sessionID() || !input.messagesReady()) return
+    requestAnimationFrame(() => applyHash("auto"))
+  })
+
+  createEffect(() => {
+    if (!input.sessionID() || !input.messagesReady()) return
+
+    input.visibleUserMessages().length
+    input.turnStart()
+
+    const targetId = input.pendingMessage() ?? messageIdFromHash(window.location.hash)
+    if (!targetId) return
+    if (input.currentMessageId() === targetId) return
+
+    const msg = input.visibleUserMessages().find((m) => m.id === targetId)
+    if (!msg) return
+
+    if (input.pendingMessage() === targetId) input.setPendingMessage(undefined)
+    input.autoScroll.pause()
+    requestAnimationFrame(() => scrollToMessage(msg, "auto"))
+  })
+
+  createEffect(() => {
+    if (!input.sessionID() || !input.messagesReady()) return
+    const handler = () => requestAnimationFrame(() => applyHash("auto"))
+    window.addEventListener("hashchange", handler)
+    onCleanup(() => window.removeEventListener("hashchange", handler))
+  })
+
+  return {
+    clearMessageHash,
+    scrollToMessage,
+    applyHash,
+  }
+}