From a104c094b588560f955ff52dc7f949cf3c355f94 Mon Sep 17 00:00:00 2001
From: Adam Malczewski <github@tradam.dev>
Date: Sat, 5 Sep 2026 00:34:45 +0900
Subject: feat(layout): plan 01 — tile engine + view registry
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/app/App.svelte                    | 1129 +++++++--------------------------
 src/app/register-views.ts             |   79 +++
 src/app/view-ports.ts                 |   54 ++
 src/app/views/CacheWarmingPane.svelte |   37 ++
 src/app/views/ChatPane.svelte         |   91 +++
 src/app/views/CompactionPane.svelte   |   48 ++
 src/app/views/ComposerPane.svelte     |   35 +
 src/app/views/ConcurrencyPane.svelte  |   39 ++
 src/app/views/ExtensionsPane.svelte   |   78 +++
 src/app/views/HeartbeatPane.svelte    |   56 ++
 src/app/views/LspPane.svelte          |   24 +
 src/app/views/McpPane.svelte          |   24 +
 src/app/views/MessageQueuePane.svelte |   40 ++
 src/app/views/ModelPane.svelte        |  131 ++++
 src/app/views/NamedAgentsPane.svelte  |   25 +
 src/app/views/SettingsPane.svelte     |   34 +
 src/app/views/SystemPromptPane.svelte |   21 +
 src/app/views/TabsPane.svelte         |   24 +
 src/app/views/TasksPane.svelte        |   29 +
 src/app/views/VisionPane.svelte       |   45 ++
 20 files changed, 1138 insertions(+), 905 deletions(-)
 create mode 100644 src/app/register-views.ts
 create mode 100644 src/app/view-ports.ts
 create mode 100644 src/app/views/CacheWarmingPane.svelte
 create mode 100644 src/app/views/ChatPane.svelte
 create mode 100644 src/app/views/CompactionPane.svelte
 create mode 100644 src/app/views/ComposerPane.svelte
 create mode 100644 src/app/views/ConcurrencyPane.svelte
 create mode 100644 src/app/views/ExtensionsPane.svelte
 create mode 100644 src/app/views/HeartbeatPane.svelte
 create mode 100644 src/app/views/LspPane.svelte
 create mode 100644 src/app/views/McpPane.svelte
 create mode 100644 src/app/views/MessageQueuePane.svelte
 create mode 100644 src/app/views/ModelPane.svelte
 create mode 100644 src/app/views/NamedAgentsPane.svelte
 create mode 100644 src/app/views/SettingsPane.svelte
 create mode 100644 src/app/views/SystemPromptPane.svelte
 create mode 100644 src/app/views/TabsPane.svelte
 create mode 100644 src/app/views/TasksPane.svelte
 create mode 100644 src/app/views/VisionPane.svelte

(limited to 'src/app')

diff --git a/src/app/App.svelte b/src/app/App.svelte
index f2d7e9c..b7eb783 100644
--- a/src/app/App.svelte
+++ b/src/app/App.svelte
@@ -1,919 +1,238 @@
-<script lang="ts">
-	import type { ImageInput } from "@dispatch/transport-contract";
-	import type { InvokeMessage } from "@dispatch/ui-contract";
-	import { tick } from "svelte";
-	import Table from "../components/Table.svelte";
-	import {
-		CacheWarmingView,
-		manifest as cacheWarmingManifest,
-		type WarmFeedback,
-	} from "../features/cache-warming";
-	import {
-		ChatView,
-		CompactionView,
-		Composer,
-		manifest as chatManifest,
-		ModelSelector,
-		ReasoningEffortSelector,
-		type CompactNowResult,
-		type ComposerStatus,
-		type SaveCompactPercentResult,
-		type ThinkingSelection,
-		type ThinkingSelectionSaveResult,
-	} from "../features/chat";
-	import { manifest as conversationCacheManifest } from "../features/conversation-cache";
-	import { manifest as markdownManifest } from "../features/markdown";
-	import {
-		McpStatusView,
-		manifest as mcpManifest,
-		type McpStatusResult,
-	} from "../features/mcp";
-	import {
-		ChatLimitField,
-		manifest as settingsManifest,
-		type ChatLimitSaveResult,
-	} from "../features/settings";
-	import {
-		createSmartScrollController,
-		manifest as smartScrollManifest,
-		ScrollToBottom,
-	} from "../features/smart-scroll";
-	import { manifest as surfaceHostManifest, SurfaceView } from "../features/surface-host";
-	import { parseMessageQueuePayload } from "../features/surface-host/logic/message-queue";
-	import { parseTodoPayload } from "../features/surface-host/logic/todo";
-	import TodoList from "../features/surface-host/ui/TodoList.svelte";
-	import { manifest as tabsManifest, TabList } from "../features/tabs";
-	import { manifest as viewsManifest, ViewSidebar } from "../features/views";
-	import {
-		manifest as namedAgentsManifest,
-		NamedAgentsView,
-		type NamedAgentInput,
-		type NamedAgentSelectionSnapshot,
-	} from "../features/named-agents";
-	import {
-		CwdField,
-		type CwdSaveResult,
-		LspStatusView,
-		type LspStatusResult,
-		manifest as cwdLspManifest,
-	} from "../features/cwd-lsp";
-	import {
-		ComputerField,
-		manifest as computerManifest,
-		type ComputerSaveResult,
-		type ComputerStatusResult,
-		type LoadComputerStatus,
-		type SaveComputer,
-		type TestComputer,
-		type TestComputerResult,
-	} from "../features/computer";
-	import {
-		HeartbeatView,
-		manifest as heartbeatManifest,
-		RunModal,
-		type HeartbeatConfigResult,
-		type HeartbeatNextRunResult,
-		type HeartbeatRunView,
-		type HeartbeatRunsResult,
-		type HeartbeatStopResult,
-	} from "../features/heartbeat";
-	import {
-		ConcurrencyView,
-		manifest as concurrencyManifest,
-		type DeleteConcurrencyLimit,
-		type LoadConcurrencyLimits,
-		type LoadConcurrencyStatus,
-		type SaveConcurrencyCooldown,
-		type SaveConcurrencyLimit,
-	} from "../features/concurrency";
-	import type { ChatStore } from "../features/chat";
-	import {
-		SystemPromptBuilder,
-		type LoadSystemPrompt as LoadSystemPromptAlias,
-		type LoadSystemPromptVariables as LoadSystemPromptVariablesAlias,
-		type SaveSystemPrompt as SaveSystemPromptAlias,
-		manifest as systemPromptManifest,
-	} from "../features/system-prompt";
-	import {
-		VisionSettingsView,
-		manifest as visionManifest,
-		type LoadVisionSettingsResult,
-		type SaveVisionSettingsResult,
-		type VisionSettingsPatch,
-	} from "../features/vision";
-	import type { AppStore } from "./store.svelte";
-	import ErrorModal from "./ErrorModal.svelte";
-	import { createLocalStore } from "../adapters/local-storage";
-	import { untrack } from "svelte";
-
-	let { store, onNavigate }: { store: AppStore; onNavigate: (path: string) => void } = $props();
-
-	// The backend's conversation-scoped cache-warming surface. Referenced by id at
-	// the composition root (sanctioned discovery-by-id) to give it a dedicated view
-	// and keep it out of the generic Extensions surface list — SurfaceView itself
-	// stays fully generic (it never switches on a surface id).
-	const CACHE_WARMING_ID = "cache-warming";
-	// The message-queue extension's per-conversation surface (steering). Pulled
-	// out of the generic Extensions list and rendered as a compact panel above the
-	// composer — pending steering messages are tied to the chat, not the sidebar.
-	const MESSAGE_QUEUE_ID = "message-queue";
-	// The `todo` extension's per-conversation task list surface (model-maintained).
-	const TODO_ID = "todo";
-
-	// The view kinds offered in the sidebar's dropdown. Generic data — the
-	// `viewContent` snippet below maps each kind id to its renderer.
-	const viewKinds = [
-		{ id: "tabs", label: "Tabs" },
-		{ id: "model", label: "Model" },
-		{ id: "named-agents", label: "Named Agents" },
-		{ id: "lsp", label: "Language Servers" },
-		{ id: "mcp", label: "MCP Servers" },
-		{ id: "extensions", label: "Extensions" },
-		{ id: "cache-warming", label: "Cache Warming" },
-		{ id: "tasks", label: "Tasks" },
-		{ id: "compaction", label: "Compaction" },
-		{ id: "vision", label: "Vision" },
-		{ id: "heartbeat", label: "Heartbeat" },
-		{ id: "concurrency", label: "Concurrency" },
-		{ id: "system-prompt", label: "System Prompt" },
-		{ id: "settings", label: "Settings" },
-	] as const;
-
-	// Default sidebar layout: the Tabs list (the moved-from-top tab bar) plus the
-	// Model view, so a fresh user sees their conversations + model controls.
-	const DEFAULT_VIEWS: readonly string[] = ["tabs", "model"];
-	const sidebarStore = createLocalStore<readonly string[]>("dispatch.sidebar.views", {
-		storage: untrack(() => store.storage),
-	});
-	const sidebarPanels = sidebarStore.load() ?? DEFAULT_VIEWS;
-
-	function handleSidebarChange(kinds: readonly (string | null)[]): void {
-		sidebarStore.save(kinds.filter((k): k is string => k !== null));
-	}
-
-	// Frontend module list for the "Loaded Modules" view, AGGREGATED from each
-	// feature's public `manifest` export so it can't drift from what's actually
-	// composed. (The backend's "Loaded Extensions" surface is a SEPARATE,
-	// backend-owned list.) FE features are internal units of this single repo, so
-	// there is no per-module version — they all share dispatch-web's version.
-	const MODULE_COLUMNS = ["Module", "Description"] as const;
-	const loadedModules: readonly (readonly [string, string])[] = [
-		chatManifest,
-		tabsManifest,
-		surfaceHostManifest,
-		viewsManifest,
-		conversationCacheManifest,
-		markdownManifest,
-		cacheWarmingManifest,
-		cwdLspManifest,
-		mcpManifest,
-		computerManifest,
-		smartScrollManifest,
-		settingsManifest,
-		systemPromptManifest,
-		heartbeatManifest,
-		concurrencyManifest,
-		visionManifest,
-		namedAgentsManifest,
-	].map((m) => [m.name, m.description] as const);
-
-	// Smart-scroll: keep the transcript pinned to the bottom while it streams,
-	// unless the reader has scrolled up (then show a "scroll to bottom" button).
-	// One controller owns the chat scroll region; effects below feed it the edges.
-	const smartScroll = createSmartScrollController();
-	let transcriptEl = $state<HTMLElement | undefined>();
-	let transcriptContentEl = $state<HTMLElement | undefined>();
-
-	// Chat-limit unload gate: old chunks may be unloaded only while the reader is
-	// stuck to the bottom. While stuck, a trim removes content far ABOVE the
-	// viewport and the controller re-pins to the bottom — no visible jump; while
-	// reading history, trimming is deferred instead of yanking the page (the old
-	// Dispatch bug). In an $effect so a swapped store prop would be re-wired.
-	$effect(() => {
-		store.attachUnloadGate(() => smartScroll.isAtBottom());
-	});
-
-	// "Show earlier messages": page older history back in, preserving the reader's
-	// viewport position — prepended content grows scrollHeight, so shift scrollTop
-	// by the growth (the manual analogue of CSS scroll anchoring, which not every
-	// engine applies here).
-	async function handleShowEarlier(): Promise<void> {
-		const el = transcriptEl;
-		const prevHeight = el?.scrollHeight ?? 0;
-		const prevTop = el?.scrollTop ?? 0;
-		await store.activeChat.showEarlier();
-		await tick();
-		if (el) {
-			const delta = el.scrollHeight - prevHeight;
-			if (delta > 0) el.scrollTop = prevTop + delta;
-		}
-	}
-
-	// Attach/detach the controller to the live scroll element + content (disposed on
-	// unmount). The content element is observed (ResizeObserver) so the view follows
-	// height changes that aren't a transcript append.
-	$effect(() => {
-		if (!transcriptEl) return;
-		return smartScroll.attach(transcriptEl, transcriptContentEl);
-	});
-
-	// New transcript content streamed in (or messages loaded) → follow the bottom
-	// while stuck. Reads `chunks.length` so the effect re-runs on every append.
-	$effect(() => {
-		void store.activeChat.chunks.length;
-		smartScroll.contentChanged();
-	});
-
-	// The message-queue surface spec + whether it currently has pending messages
-	// (steering). Rendered as a compact panel above the composer only when non-empty.
-	const messageQueueSpec = $derived(store.surface(MESSAGE_QUEUE_ID));
-	const hasQueuedMessages = $derived.by(() => {
-		const spec = messageQueueSpec;
-		if (spec === null) return false;
-		const field = spec.fields.find((f) => f.kind === "custom" && f.rendererId === MESSAGE_QUEUE_ID);
-		if (field === undefined || field.kind !== "custom") return false;
-		const data = parseMessageQueuePayload(field.payload);
-		return data !== null && data.messages.length > 0;
-	});
-
-	// The todo surface spec + its parsed task list (model-maintained, read-only).
-	const todoSpec = $derived(store.surface(TODO_ID));
-	const todoData = $derived.by(() => {
-		const spec = todoSpec;
-		if (spec === null) return null;
-		const field = spec.fields.find((f) => f.kind === "custom" && f.rendererId === TODO_ID);
-		if (field === undefined || field.kind !== "custom") return null;
-		return parseTodoPayload(field.payload);
-	});
-
-	// Top-bar title: the active tab's title, or "New Tab" when no tab is active
-	// (a fresh, unstarted draft — the conversation hasn't been sent yet, so no
-	// tab exists). Pure-derived from the (workspace-filtered) tab set + the
-	// active id; reflects whichever tab is selected in the sidebar's Tabs view.
-	const NEW_TAB_TITLE = "New Tab";
-	const topBarTitle = $derived.by(() => {
-		const id = store.activeConversationId;
-		if (id === null) return NEW_TAB_TITLE;
-		const tab = store.tabs.find((t) => t.conversationId === id);
-		return tab?.title ?? NEW_TAB_TITLE;
-	});
-
-	// The composer status-bar status. Priority: error > queued > running > idle.
-	// `queued` (the turn is in flight but waiting for a concurrency slot — CR-13)
-	// wins over `running` so the corner shows a ring, not dots, during the wait.
-	// `turn-start` fires before the slot is granted, so `generating` is already
-	// true while `conversationStatus === "queued"`; the explicit queued check is
-	// what distinguishes the two.
-	const composerStatus = $derived.by<ComposerStatus>(() => {
-		if (store.activeChat.error) return "error";
-		const id = store.activeConversationId;
-		if (id !== null && store.conversationStatus(id) === "queued") return "queued";
-		return store.activeChat.generating ? "running" : "idle";
-	});
-
-	// Conversation/tab switch → snap to the bottom of the new transcript.
-	$effect(() => {
-		void store.activeConversationId;
-		smartScroll.reset();
-	});
-
-	// Right sidebar: persisted open/closed state. Defaults to open on wide
-	// screens (first visit), then remembers the user's toggle thereafter.
-	const WIDE_BREAKPOINT = 1024; // Tailwind `lg`
-	const sidebarOpenStore = createLocalStore<boolean>("dispatch.sidebar.open", {
-		storage: untrack(() => store.storage),
-	});
-	const storedSidebarOpen = sidebarOpenStore.load();
-	let sidebarOpen = $state(storedSidebarOpen ?? (typeof window !== "undefined" ? window.innerWidth >= WIDE_BREAKPOINT : true));
-	let systemPromptModalOpen = $state(false);
-	// The heartbeat run currently open in the fullscreen run-chat modal (null =
-	// closed). Holds a snapshot run view; the modal re-mounts per run (keyed).
-	let heartbeatRun = $state<HeartbeatRunView | null>(null);
-
-	$effect(() => {
-		sidebarOpenStore.save(sidebarOpen);
-	});
-
-	function handleInvoke(msg: InvokeMessage) {
-		store.invoke(msg.surfaceId, msg.actionId, msg.payload);
-	}
-
-	function handleSend(text: string, images?: readonly ImageInput[]): void {
-		store.send(text, images);
-	}
-
-	function handleQueue(text: string) {
-		store.queueMessage(text);
-	}
-
-	function handleCancelQueuedMessage(messageId: string) {
-		store.cancelQueuedMessage(messageId);
-	}
-
-	function handleStop() {
-		store.stopGeneration();
-	}
-
-	function handleSelectModel(model: string) {
-		store.selectModel(model);
-	}
-
-	// A Named Agent selected in the model selector: resolve it to its raw model
-	// AND record the snapshot on the active conversation (plan §6/§7). The store
-	// persists the raw model to `/conversations/:id/model` + retains the snapshot
-	// on the tab.
-	function handleSelectNamedAgent(snapshot: NamedAgentSelectionSnapshot) {
-		store.selectModel(snapshot.model, snapshot);
-	}
-
-	// Adapt the store's Named Agent CRUD to the named-agents feature's ports.
-	const namedAgentPorts = {
-		create: (input: NamedAgentInput) => store.createNamedAgent(input),
-		update: (id: string, input: NamedAgentInput) => store.updateNamedAgent(id, input),
-		remove: (id: string) => store.deleteNamedAgent(id),
-	};
-
-	// Adapt the store's WarmResult to the cache-warming feature's WarmNow port.
-	async function warmNow(): Promise<WarmFeedback | null> {
-		const result = await store.warmNow();
-		if (result === null) return null;
-		return result.ok
-			? {
-					ok: true,
-					cachePct: result.response.cachePct,
-					expectedCacheRate: result.response.expectedCacheRate,
-				}
-			: { ok: false, error: result.error };
-	}
-
-	// Adapt the store's reasoning-effort + thinking results to the chat
-	// feature's combined selector port. The selector sends ONE selection ("off"
-	// or a level); the adapter fans it out to the right per-axis PUT(s). "off" is
-	// a SEPARATE signal from the effort level: it persists `thinking: false`
-	// (the umans route maps that to `reasoning_effort: "none"`), leaving the
-	// effort level untouched so an off→on toggle restores it. A level ensures
-	// thinking is ON (the level is meaningless while thinking is off) then sets
-	// the effort level.
-	async function saveThinkingSelection(
-		selection: ThinkingSelection,
-	): Promise<ThinkingSelectionSaveResult | null> {
-		if (selection === "off") {
-			const result = await store.setThinking(false);
-			if (result === null) return null;
-			return result.ok
-				? { ok: true, selection: "off" }
-				: { ok: false, error: result.error };
-		}
-		// A level: enable thinking first if it is currently off, then set the level.
-		if (store.thinking === false) {
-			const on = await store.setThinking(true);
-			if (on !== null && !on.ok) {
-				return { ok: false, error: on.error };
-			}
-		}
-		const result = await store.setReasoningEffort(selection);
-		if (result === null) return null;
-		return result.ok
-			? { ok: true, selection: result.reasoningEffort }
-			: { ok: false, error: result.error };
-	}
+<script module lang="ts">
+  import { registerBuiltinViews } from "./register-views";
 
-	// Adapt the store's compact result to the compaction view's port.
-	async function compactNow(): Promise<CompactNowResult | null> {
-		const result = await store.compactNow();
-		if (result === null) return null;
-		return result.ok
-			? {
-					ok: true,
-					messagesSummarized: result.response.messagesSummarized,
-					messagesKept: result.response.messagesKept,
-				}
-			: { ok: false, error: result.error };
-	}
-
-	async function saveCompactPercent(
-		percent: number,
-	): Promise<SaveCompactPercentResult | null> {
-		const result = await store.setCompactPercent(percent);
-		if (result === null) return null;
-		return result.ok
-			? { ok: true, percent: result.percent }
-			: { ok: false, error: result.error };
-	}
-
-	// Adapt the store's global vision-settings API to the vision feature's ports.
-	async function loadVisionSettings(): Promise<LoadVisionSettingsResult> {
-		// The store seeds `visionSettings` on boot; a refresh keeps it current.
-		await store.refreshVisionSettings();
-		const settings = store.visionSettings;
-		if (settings === null) {
-			return { ok: false, error: "Vision settings not available." };
-		}
-		return { ok: true, settings };
-	}
-
-	async function saveVisionSettings(
-		patch: VisionSettingsPatch,
-	): Promise<SaveVisionSettingsResult> {
-		const result = await store.setVisionSettings(patch);
-		if (result === null) return { ok: false, error: "Vision settings not available." };
-		return result.ok
-			? { ok: true, settings: result.settings }
-			: { ok: false, error: result.error };
-	}
-
-	// Adapt the store's chat-limit result to the settings feature's port. On a
-	// raise the active chat refills (prepends older history); preserve the
-	// reader's viewport over the prepend (the manual analogue of CSS scroll
-	// anchoring), exactly like `handleShowEarlier`.
-	async function saveChatLimit(value: number): Promise<ChatLimitSaveResult> {
-		const el = transcriptEl;
-		const prevHeight = el?.scrollHeight ?? 0;
-		const prevTop = el?.scrollTop ?? 0;
-		const result = await store.setChatLimit(value);
-		await tick();
-		if (el) {
-			const delta = el.scrollHeight - prevHeight;
-			if (delta > 0) el.scrollTop = prevTop + delta;
-		}
-		return result.ok
-			? { ok: true, chatLimit: result.chatLimit }
-			: { ok: false, error: result.error };
-	}
-
-	// Adapt the store's cwd/LSP results to the cwd-lsp feature's ports.
-	async function saveCwd(cwd: string): Promise<CwdSaveResult | null> {
-		const result = await store.setCwd(cwd);
-		if (result === null) return null;
-		return result.ok ? { ok: true, cwd: result.cwd } : { ok: false, error: result.error };
-	}
-
-	async function loadLspStatus(): Promise<LspStatusResult | null> {
-		const result = await store.lspStatus();
-		if (result === null) return null;
-		return result.ok
-			? { ok: true, cwd: result.response.cwd, servers: result.response.servers }
-			: { ok: false, error: result.error };
-	}
-
-	// Adapt the store's computer results to the computer feature's ports.
-	async function saveComputer(computerId: string | null): Promise<ComputerSaveResult | null> {
-		const result = await store.setComputer(computerId);
-		if (result === null) return null;
-		return result.ok ? { ok: true, computerId: result.computerId } : { ok: false, error: result.error };
-	}
-
-	const loadComputerStatus: LoadComputerStatus = async (
-		alias: string,
-	): Promise<ComputerStatusResult | null> => {
-		const result = await store.computerStatus(alias);
-		if (result === null) return null;
-		return result.ok ? { ok: true, status: result.response } : { ok: false, error: result.error };
-	};
-
-	const testComputer: TestComputer = async (
-		alias: string,
-	): Promise<TestComputerResult | null> => {
-		const result = await store.testComputer(alias);
-		if (result === null) return null;
-		return result.ok ? { ok: true, response: result.response } : { ok: false, error: result.error };
-	};
-
-	async function loadMcpStatus(): Promise<McpStatusResult | null> {
-		const result = await store.mcpStatus();
-		if (result === null) return null;
-		return result.ok
-			? { ok: true, cwd: result.response.cwd, servers: result.response.servers }
-			: { ok: false, error: result.error };
-	}
-
-	// Adapt the store's system prompt results to the system-prompt feature's ports.
-	const loadSystemPromptPrompt: LoadSystemPromptAlias = () => store.loadSystemPrompt();
-
-	const loadSystemPromptVariablesPrompt: LoadSystemPromptVariablesAlias = () =>
-		store.loadSystemPromptVariables();
-
-	const saveSystemPromptPrompt: SaveSystemPromptAlias = (template) => store.setSystemPrompt(template);
-
-	// Adapt the store's heartbeat results to the heartbeat feature's ports. The
-	// store returns the feature's result types directly (the API is a plain REST
-	// surface, not a transport-contract type), so the adapter is a thin passthrough
-	// (kept for structural consistency with cwd-lsp/mcp/computer — see AGENTS.md
-	// "contracts are the cross-unit surface").
-	async function loadHeartbeatConfig(): Promise<HeartbeatConfigResult> {
-		return store.heartbeatConfig();
-	}
-
-	async function saveHeartbeatConfig(
-		patch: Parameters<typeof store.setHeartbeatConfig>[0],
-	): Promise<HeartbeatConfigResult> {
-		return store.setHeartbeatConfig(patch);
-	}
-
-	async function loadHeartbeatRuns(): Promise<HeartbeatRunsResult> {
-		return store.heartbeatRuns();
-	}
-
-	async function stopHeartbeatRun(runId: string): Promise<HeartbeatStopResult> {
-		return store.stopHeartbeatRun(runId);
-	}
-
-	async function loadHeartbeatNextRun(): Promise<HeartbeatNextRunResult> {
-		return store.heartbeatNextRun();
-	}
-
-	// Run-chat modal: open a live watch on the run's conversation (the store owns
-	// the ChatStore + the `chat.subscribe` stream), and tear it down on close.
-	function openRunChat(conversationId: string): ChatStore {
-		return store.watchConversation(conversationId);
-	}
-	function closeRunChat(conversationId: string): void {
-		store.unwatchConversation(conversationId);
-	}
-
-	// Adapt the store's concurrency results to the feature's ports. The store
-	// returns the feature's result types directly (the API is a plain REST surface
-	// under /concurrency, not a workspace/conversation-scoped one), so the adapter
-	// is a thin passthrough (kept for structural consistency — AGENTS.md "contracts
-	// are the cross-unit surface").
-	const loadConcurrencyLimits: LoadConcurrencyLimits = () => store.concurrencyLimits();
-	const saveConcurrencyLimit: SaveConcurrencyLimit = (providerId, limit) =>
-		store.setConcurrencyLimit(providerId, limit);
-	const deleteConcurrencyLimit: DeleteConcurrencyLimit = (providerId) =>
-		store.deleteConcurrencyLimit(providerId);
-	const loadConcurrencyStatus: LoadConcurrencyStatus = () => store.concurrencyStatus();
-	const saveConcurrencyCooldown: SaveConcurrencyCooldown = (providerId, cooldownMs) =>
-		store.setConcurrencyCooldown(providerId, cooldownMs);
+  // Register every built-in view ONCE per app load, BEFORE any tile renders.
+  // The composition root stays the only place store ports are wired: the
+  // wrappers receive them through `ports` (see `view-ports.ts`).
+  registerBuiltinViews();
 </script>
 
-<main class="relative flex h-screen overflow-hidden">
-	<!-- LEFT: everything except the sidebar. The full-height sidebar is a sibling
-	     (below), so opening it shrinks this ENTIRE column. -->
-	<div class="flex min-w-0 flex-1 flex-col overflow-hidden pt-[5px]">
-		<!-- Slim header: the tab bar moved into the sidebar (the "Tabs" view), so
-		     the top row now shows the active tab's title on the left (or "New Tab"
-		     for an unstarted draft), with the build version + sidebar toggle on
-		     the right. -->
-		<div class="flex items-center justify-between gap-2 px-2 py-2">
-			<span
-				class="min-w-0 flex-1 shrink truncate pl-2 text-sm font-medium opacity-70"
-				data-testid="top-bar-title"
-				title={topBarTitle}
-				aria-label="Active conversation title"
-			>
-				{topBarTitle}
-			</span>
-			<a
-				href="/"
-				class="btn btn-ghost btn-sm shrink-0 px-2"
-				aria-label="Back to dashboard"
-				title="Back to dashboard"
-				onclick={(e) => {
-					e.preventDefault();
-					onNavigate("/");
-				}}
-			>
-				<svg
-					xmlns="http://www.w3.org/2000/svg"
-					fill="none"
-					viewBox="0 0 24 24"
-					stroke-width="2"
-					stroke="currentColor"
-					class="size-4"
-					aria-hidden="true"
-				>
-					<path
-						stroke-linecap="round"
-						stroke-linejoin="round"
-						d="m2.25 12 8.954-8.955c.44-.439 1.152-.439 1.591 0L21.75 12M4.5 9.75v10.5a.75.75 0 0 0 .75.75h4.5a.75.75 0 0 0 .75-.75V15a.75.75 0 0 1 .75-.75h3a.75.75 0 0 1 .75.75v5.25a.75.75 0 0 0 .75.75h4.5a.75.75 0 0 0 .75-.75V9.75M8.25 21h8.25"
-					/>
-				</svg>
-			</a>
-			<span
-				class="shrink-0 select-none px-1 font-mono text-[10px] leading-none text-base-content/30"
-				title="Build version (git short hash)"
-			>
-				build: {__APP_VERSION__}
-			</span>
-			<button
-				class="btn btn-square btn-ghost btn-sm mx-1 shrink-0"
-				aria-label={sidebarOpen ? "Close sidebar" : "Open sidebar"}
-				aria-expanded={sidebarOpen}
-				onclick={() => (sidebarOpen = !sidebarOpen)}
-			>
-				<svg
-					xmlns="http://www.w3.org/2000/svg"
-					fill="none"
-					viewBox="0 0 24 24"
-					stroke-width="2"
-					stroke="currentColor"
-					class="size-5"
-					aria-hidden="true"
-				>
-					{#if sidebarOpen}
-						<!-- Sidebar open → chevrons point right -->
-						<path
-							stroke-linecap="round"
-							stroke-linejoin="round"
-							d="m11.25 4.5 7.5 7.5-7.5 7.5m-7.5-15 7.5 7.5-7.5 7.5"
-						/>
-					{:else}
-						<!-- Sidebar closed → chevrons point left -->
-						<path
-							stroke-linecap="round"
-							stroke-linejoin="round"
-							d="M18.75 19.5l-7.5-7.5 7.5-7.5m-6 15L5.25 12l7.5-7.5"
-						/>
-					{/if}
-				</svg>
-			</button>
-		</div>
-
-		{#if store.lastError}
-			<div role="alert" class="alert alert-error mx-4 mt-2">
-				<strong>Error:</strong>
-				{store.lastError.message}
-			</div>
-		{/if}
-
-		{#if store.activeChat.error}
-			<div role="alert" class="alert alert-warning mx-4 mt-2">
-				<strong>Chat error:</strong>
-				{store.activeChat.error}
-			</div>
-		{/if}
-
-		<div class="relative min-h-0 min-w-0 flex-1 pr-4">
-			<div bind:this={transcriptEl} class="h-full overflow-y-auto">
-				<div bind:this={transcriptContentEl}>
-					{#key store.activeConversationId}
-						<ChatView
-							chunks={store.activeChat.chunks}
-							turnMetrics={store.activeChat.turnMetrics}
-							hasEarlier={store.activeChat.hasEarlier}
-							onShowEarlier={handleShowEarlier}
-							thinkingKeyBase={store.activeChat.thinkingKeyBase}
-							providerRetry={store.activeChat.providerRetry}
-							apiBaseUrl={store.httpBase}
-						/>
-					{/key}
-				</div>
-			</div>
-			{#if store.activeChat.chunks.length === 0}
-				<div
-					class="pointer-events-none absolute inset-0 flex items-center justify-center"
-					aria-hidden="true"
-				>
-					<span class="select-none text-4xl font-bold opacity-10">Dispatch</span>
-				</div>
-			{/if}
-			<ScrollToBottom show={smartScroll.showButton} onResume={() => smartScroll.resume()} />
-		</div>
-
-		{#if hasQueuedMessages && messageQueueSpec !== null}
-			<!-- Pending steering messages (the message-queue surface). Rendered via
-			     the generic SurfaceView (dispatches on rendererId, never surface id);
-			     only shown when the queue is non-empty — an idle queue is hidden. -->
-			<div class="px-4 pt-2">
-				<SurfaceView
-					spec={messageQueueSpec}
-					onInvoke={handleInvoke}
-					onCancelQueuedMessage={handleCancelQueuedMessage}
-				/>
-			</div>
-		{/if}
-
-		<Composer
-			onSend={handleSend}
-			onQueue={handleQueue}
-			onStop={handleStop}
-			contextSize={store.activeChat.currentContextSize}
-			contextWindow={store.modelInfo[store.activeModel]?.contextWindow}
-			status={composerStatus}
-		/>
-	</div>
-
-	<!-- Full-height right sidebar. On wide screens (`lg:relative`) it is in-flow, so
-	     opening it shrinks the whole left column (push). Below `lg` it overlays
-	     (`max-lg:absolute`, full height) with a backdrop. -->
-	<aside
-		class="flex shrink-0 flex-col overflow-x-hidden transition-[width] duration-300 ease-out max-lg:absolute max-lg:inset-y-0 max-lg:right-0 max-lg:z-30 lg:relative"
-		class:w-80={sidebarOpen}
-		class:w-0={!sidebarOpen}
-	>
-		<div
-			class="flex h-full w-80 flex-col gap-2 overflow-y-auto bg-base-100 pt-3 pr-3 pb-3 transition-transform duration-300 ease-out"
-			style="transform: translateX({sidebarOpen ? '0' : '100%'})"
-		>
-			<ViewSidebar kinds={viewKinds} initial={sidebarPanels} onChange={handleSidebarChange} content={viewContent} />
-		</div>
-	</aside>
+<script lang="ts">
+  import type { LayoutTree } from "@dispatch/layout-contract";
+  import { untrack } from "svelte";
+  import { createLocalStore } from "../adapters/local-storage";
+  import {
+    createCollapseStore,
+    firstCollapsibleNodeId,
+    firstPanelsNode,
+    listPanelViews,
+    TileRoot,
+  } from "../features/layout";
+  import { RunModal, type HeartbeatRunView } from "../features/heartbeat";
+  import { SystemPromptBuilder } from "../features/system-prompt";
+  import type { AppStore } from "./store.svelte";
+  import { seedLayout } from "../features/layout";
+  import type { AppViewPorts, ChatViewportBridge } from "./view-ports";
+  import ErrorModal from "./ErrorModal.svelte";
+
+  let { store, onNavigate }: { store: AppStore; onNavigate: (path: string) => void } = $props();
+
+  // Modal chrome — app shell state, OUTSIDE the tree (layout-00 decision 2).
+  let systemPromptModalOpen = $state(false);
+  // The heartbeat run currently open in the fullscreen run-chat modal (null =
+  // closed). Holds a snapshot run view; the modal re-mounts per run (keyed).
+  let heartbeatRun = $state<HeartbeatRunView | null>(null);
+
+  // --- The layout tree: seeded from DEFAULT_LAYOUT (the compatibility tree
+  // that reproduces today's layout) with the sidebar selection overlaid from
+  // localStorage — today's exact boot behavior (unknown/removed kinds dropped;
+  // nothing valid stored → the tabs+model defaults).
+  const sidebarStore = createLocalStore<readonly string[]>("dispatch.sidebar.views", {
+    storage: untrack(() => store.storage),
+  });
+  let tree = $state<LayoutTree>(
+    seedLayout(sidebarStore.load(), listPanelViews().map((v) => v.id)),
+  );
+
+  // Tile edits flow up from the panels; the OWNER decides persistence. The
+  // panels selection is written back to the SAME key in the SAME format
+  // (`dispatch.sidebar.views` — a JSON array of view ids) so the storage stays
+  // byte-compatible with today (plan 02 migrates it).
+  function handleTreeChange(next: LayoutTree): void {
+    tree = next;
+    const panels = firstPanelsNode(next);
+    if (panels !== null) {
+      sidebarStore.save(panels.node.panels.map((p) => p.view));
+    }
+  }
+
+  // --- Sidebar collapse: renderer chrome state (per-node-id open/closed),
+  // persisted with the SAME key/semantics as today (`dispatch.sidebar.open`, a
+  // bare boolean, default open on wide screens). The toggle drives the tree's
+  // single collapsible node ("side" on the default tree; generically the first
+  // collapsible split child).
+  const collapse = createCollapseStore({
+    storage: untrack(() => store.storage),
+    viewportWidth: typeof window !== "undefined" ? window.innerWidth : undefined,
+  });
+  const collapseState = $derived($collapse);
+  const collapseKey = $derived(firstCollapsibleNodeId(tree));
+  const sidebarOpen = $derived(
+    collapseKey !== null ? (collapseState.openByNode[collapseKey] ?? collapseState.defaultOpen) : false,
+  );
+
+  function toggleSidebar(): void {
+    if (collapseKey !== null) collapse.toggle(collapseKey);
+  }
+
+  // --- The port bag every view wrapper receives. This is the ONE place the
+  // store's ports are wired (AGENTS.md: composition root). `store` is read
+  // through a getter so a swapped store prop stays reactive through it.
+  const chatViewport: ChatViewportBridge = { el: null };
+  const viewPorts: AppViewPorts = {
+    get store() {
+      return store;
+    },
+    chatViewport,
+    openSystemPromptBuilder: () => (systemPromptModalOpen = true),
+    openHeartbeatRun: (run) => (heartbeatRun = run),
+  };
+
+  // Top-bar title: the active tab's title, or "New Tab" when no tab is active
+  // (a fresh, unstarted draft — the conversation hasn't been sent yet, so no
+  // tab exists). Pure-derived from the (workspace-filtered) tab set + the
+  // active id; reflects whichever tab is selected in the sidebar's Tabs view.
+  const NEW_TAB_TITLE = "New Tab";
+  const topBarTitle = $derived.by(() => {
+    const id = store.activeConversationId;
+    if (id === null) return NEW_TAB_TITLE;
+    const tab = store.tabs.find((t) => t.conversationId === id);
+    return tab?.title ?? NEW_TAB_TITLE;
+  });
+
+  function handleInvokeHome(): void {
+    onNavigate("/");
+  }
+</script>
 
-	<!-- Backdrop: only on narrow screens (overlay mode), click to close. -->
-	{#if sidebarOpen}
-		<!-- svelte-ignore a11y_no_static_element_interactions -->
-		<div
-			class="fixed inset-0 z-20 bg-black/30 lg:hidden"
-			role="button"
-			tabindex="0"
-			aria-label="Close sidebar"
-			onclick={() => (sidebarOpen = false)}
-			onkeydown={(e) => {
-				if (e.key === "Escape" || e.key === "Enter") sidebarOpen = false;
-			}}
-		></div>
-	{/if}
+<main class="relative flex h-screen flex-col overflow-hidden pt-[5px]">
+  <!-- Slim header: the tab bar moved into the sidebar (the "Tabs" view), so
+       the top row now shows the active tab's title on the left (or "New Tab"
+       for an unstarted draft), with the build version + sidebar toggle on
+       the right. CHROME — stays outside the tree (layout-00 decision 2). -->
+  <div class="flex items-center justify-between gap-2 px-2 py-2">
+    <span
+      class="min-w-0 flex-1 shrink truncate pl-2 text-sm font-medium opacity-70"
+      data-testid="top-bar-title"
+      title={topBarTitle}
+      aria-label="Active conversation title"
+    >
+      {topBarTitle}
+    </span>
+    <a
+      href="/"
+      class="btn btn-ghost btn-sm shrink-0 px-2"
+      aria-label="Back to dashboard"
+      title="Back to dashboard"
+      onclick={(e) => {
+        e.preventDefault();
+        handleInvokeHome();
+      }}
+    >
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        fill="none"
+        viewBox="0 0 24 24"
+        stroke-width="2"
+        stroke="currentColor"
+        class="size-4"
+        aria-hidden="true"
+      >
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          d="m2.25 12 8.954-8.955c.44-.439 1.152-.439 1.591 0L21.75 12M4.5 9.75v10.5a.75.75 0 0 0 .75.75h4.5a.75.75 0 0 0 .75-.75V15a.75.75 0 0 1 .75-.75h3a.75.75 0 0 1 .75.75v5.25a.75.75 0 0 0 .75.75h4.5a.75.75 0 0 0 .75-.75V9.75M8.25 21h8.25"
+        />
+      </svg>
+    </a>
+    <span
+      class="shrink-0 select-none px-1 font-mono text-[10px] leading-none text-base-content/30"
+      title="Build version (git short hash)"
+    >
+      build: {__APP_VERSION__}
+    </span>
+    {#if collapseKey !== null}
+      <button
+        class="btn btn-square btn-ghost btn-sm mx-1 shrink-0"
+        aria-label={sidebarOpen ? "Close sidebar" : "Open sidebar"}
+        aria-expanded={sidebarOpen}
+        onclick={toggleSidebar}
+      >
+        <svg
+          xmlns="http://www.w3.org/2000/svg"
+          fill="none"
+          viewBox="0 0 24 24"
+          stroke-width="2"
+          stroke="currentColor"
+          class="size-5"
+          aria-hidden="true"
+        >
+          {#if sidebarOpen}
+            <!-- Sidebar open → chevrons point right -->
+            <path
+              stroke-linecap="round"
+              stroke-linejoin="round"
+              d="m11.25 4.5 7.5 7.5-7.5 7.5m-7.5-15 7.5 7.5-7.5 7.5"
+            />
+          {:else}
+            <!-- Sidebar closed → chevrons point left -->
+            <path
+              stroke-linecap="round"
+              stroke-linejoin="round"
+              d="M18.75 19.5l-7.5-7.5 7.5-7.5m-6 15L5.25 12l7.5-7.5"
+            />
+          {/if}
+        </svg>
+      </button>
+    {/if}
+  </div>
+
+  {#if store.lastError}
+    <div role="alert" class="alert alert-error mx-4 mt-2">
+      <strong>Error:</strong>
+      {store.lastError.message}
+    </div>
+  {/if}
+
+  {#if store.activeChat.error}
+    <div role="alert" class="alert alert-warning mx-4 mt-2">
+      <strong>Chat error:</strong>
+      {store.activeChat.error}
+    </div>
+  {/if}
+
+  <!-- THE TREE: the tile renderer owns the content region. Tile edits are
+       applied here and persisted to dispatch.sidebar.views (above). -->
+  <div class="min-h-0 min-w-0 flex-1">
+    <TileRoot {tree} {collapse} ports={viewPorts} onTreeChange={handleTreeChange} />
+  </div>
 </main>
 
 {#if store.fatalError}
-	<ErrorModal error={store.fatalError} onDismiss={() => store.clearFatalError()} />
+  <ErrorModal error={store.fatalError} onDismiss={() => store.clearFatalError()} />
 {/if}
 
 {#if systemPromptModalOpen}
-	<SystemPromptBuilder
-		loadPrompt={loadSystemPromptPrompt}
-		savePrompt={saveSystemPromptPrompt}
-		loadVariables={loadSystemPromptVariablesPrompt}
-		onClose={() => (systemPromptModalOpen = false)}
-	/>
+  <SystemPromptBuilder
+    loadPrompt={() => store.loadSystemPrompt()}
+    savePrompt={(template) => store.setSystemPrompt(template)}
+    loadVariables={() => store.loadSystemPromptVariables()}
+    onClose={() => (systemPromptModalOpen = false)}
+  />
 {/if}
 
 {#if heartbeatRun !== null}
-	<!-- Keyed per run so switching runs (or re-opening) re-mounts the modal — a
-	     fresh watch store lifecycle per run. The modal owns the live watch
-	     (openChat/closeChat) and the Stop button. -->
-	{#key heartbeatRun.id}
-		<RunModal
-			run={heartbeatRun}
-			openChat={openRunChat}
-			closeChat={closeRunChat}
-			stopRun={stopHeartbeatRun}
-			onClose={() => (heartbeatRun = null)}
-			apiBaseUrl={store.httpBase}
-		/>
-	{/key}
+  <!-- Keyed per run so switching runs (or re-opening) re-mounts the modal — a
+       fresh watch store lifecycle per run. The modal owns the live watch
+       (openChat/closeChat) and the Stop button. -->
+  {#key heartbeatRun.id}
+    <RunModal
+      run={heartbeatRun}
+      openChat={(conversationId) => store.watchConversation(conversationId)}
+      closeChat={(conversationId) => store.unwatchConversation(conversationId)}
+      stopRun={(runId) => store.stopHeartbeatRun(runId)}
+      onClose={() => (heartbeatRun = null)}
+      apiBaseUrl={store.httpBase}
+    />
+  {/key}
 {/if}
-
-{#snippet viewContent(kind: string)}
-	{#if kind === "tabs"}
-		<!-- The conversation tab list (moved out of the top bar into the sidebar).
-		     Re-mount per workspace so the filtered tab set + scroll reset cleanly
-		     on a workspace switch. -->
-		{#key store.activeWorkspaceId}
-			<TabList
-				tabs={store.tabs}
-				activeConversationId={store.activeConversationId}
-				statusFor={(id) => store.conversationStatus(id)}
-				onSelect={(id) => store.selectTab(id)}
-				onClose={(id) => store.closeTab(id)}
-				onNewDraft={() => store.newDraft()}
-				onRename={(id, title) => store.renameTab(id, title)}
-			/>
-		{/key}
-	{:else if kind === "model"}
-		<div class="flex flex-col gap-3">
-			<ModelSelector
-			models={store.models}
-			selected={store.activeModel}
-			onSelect={handleSelectModel}
-			modelInfo={store.modelInfo}
-			namedAgents={store.namedAgents}
-			namedAgentSnapshot={store.namedAgentSnapshot}
-			onSelectNamedAgent={handleSelectNamedAgent}
-			zeroProviders={store.enabledProviderCount === 0}
-		/>
-			<!-- Keyed on the workspace conversation (active tab OR draft) so the inputs
-			     re-mount per conversation — incl. switching between drafts — and can't
-			     bleed across tabs. Editable for a draft too (cwd + effort apply from turn 1). -->
-			{#key store.currentConversationId}
-				<ReasoningEffortSelector
-					persistedEffort={store.reasoningEffort}
-					persistedThinking={store.thinking}
-					save={saveThinkingSelection}
-				/>
-				<CwdField cwd={store.cwd} canEdit={true} save={saveCwd} />
-				<ComputerField
-					computerId={store.computerId}
-					canEdit={true}
-					computers={store.computers}
-					save={saveComputer}
-					loadStatus={loadComputerStatus}
-					test={testComputer}
-				/>
-			{/key}
-		</div>
-	{:else if kind === "named-agents"}
-		<!-- Named Agents: a global, collapsible sidebar view of curated presets.
-		     The store owns the list (authoritative for the model selector + agent
-		     tooling); the view drives CRUD via injected ports (auto-save). -->
-		<NamedAgentsView
-			agents={store.namedAgents}
-			models={store.models}
-			ports={namedAgentPorts}
-		/>
-	{:else if kind === "lsp"}
-		<!-- Re-mount per conversation (incl. draft) so the loaded server list is isolated. -->
-		{#key store.currentConversationId}
-			<LspStatusView cwd={store.cwd} canView={true} load={loadLspStatus} />
-		{/key}
-	{:else if kind === "mcp"}
-		<!-- Re-mount per conversation (incl. draft) so the loaded server list is isolated. -->
-		{#key store.currentConversationId}
-			<McpStatusView cwd={store.cwd} canView={true} load={loadMcpStatus} />
-		{/key}
-	{:else if kind === "extensions"}
-		<section>
-			<h3 class="mb-1 text-xs font-semibold uppercase opacity-60">Frontend modules</h3>
-			<Table columns={MODULE_COLUMNS} rows={loadedModules} />
-		</section>
-		<section class="mt-4 flex flex-col gap-3">
-			<h3 class="text-xs font-semibold uppercase opacity-60">Surfaces</h3>
-			{#each store.surfaces.filter((s) => s.id !== CACHE_WARMING_ID && s.id !== MESSAGE_QUEUE_ID && s.id !== TODO_ID) as spec (spec.id)}
-				<SurfaceView {spec} onInvoke={handleInvoke} />
-			{/each}
-		</section>
-	{:else if kind === "cache-warming"}
-		<!-- Re-mount per conversation (like ChatView) so the view's local warming
-		     history / manual-warm feedback can't bleed across tabs. -->
-		{#key store.activeConversationId}
-			<CacheWarmingView
-				spec={store.surface(CACHE_WARMING_ID)}
-				canWarm={store.activeConversationId !== null}
-				onInvoke={handleInvoke}
-				{warmNow}
-			/>
-		{/key}
-	{:else if kind === "tasks"}
-		<!-- Re-mount per conversation so the task list is isolated per conversation.
-		     TodoList always reserves its fixed 60vh height (empty or full). -->
-		{#key store.activeConversationId}
-			<TodoList payload={todoData} />
-		{/key}
-	{:else if kind === "compaction"}
-		<!-- Message compaction is per-conversation (keyed so the percent + feedback
-		     can't bleed across tabs). -->
-		{#key store.currentConversationId}
-			<CompactionView
-				percent={store.compactPercent}
-				canCompact={store.activeConversationId !== null}
-				{compactNow}
-				savePercent={saveCompactPercent}
-			/>
-		{/key}
-	{:else if kind === "vision"}
-		<!-- Global vision settings (image-compaction limit + model). Not
-		     conversation-scoped (no {#key}), so they stay mounted across tab switches. -->
-		<VisionSettingsView
-			models={store.models}
-			modelInfo={store.modelInfo}
-			load={loadVisionSettings}
-			save={saveVisionSettings}
-		/>
-	{:else if kind === "system-prompt"}
-		<!-- Global system prompt template. Opens a full-page modal editor (half
-		     template / half variable palette). Not conversation-scoped (no {#key}). -->
-		<div class="flex flex-col gap-2">
-			<p class="text-xs opacity-60">
-				Edit the global system prompt template with variable placeholders. Opens a full-page editor.
-			</p>
-			<button
-				type="button"
-				class="btn btn-primary btn-sm"
-				onclick={() => (systemPromptModalOpen = true)}
-			>
-				Open builder
-			</button>
-		</div>
-	{:else if kind === "settings"}
-		<!-- FE-local settings. Not conversation-scoped (no {#key}: the chat limit is
-		     global), so the field stays mounted across tab switches. -->
-		<div class="flex flex-col gap-3">
-			<ChatLimitField chatLimit={store.chatLimit} save={saveChatLimit} />
-		</div>
-	{:else if kind === "heartbeat"}
-		<!-- Workspace-scoped autonomous-agent heartbeat (config + run history).
-		     Not conversation-scoped (no {#key}); the config + runs are per-workspace. -->
-		<HeartbeatView
-			models={store.models}
-			loadConfig={loadHeartbeatConfig}
-			saveConfig={saveHeartbeatConfig}
-			loadRuns={loadHeartbeatRuns}
-			stopRun={stopHeartbeatRun}
-			loadVariables={loadSystemPromptVariablesPrompt}
-			loadDefaultPrompt={loadSystemPromptPrompt}
-			loadNextRun={loadHeartbeatNextRun}
-			onOpenRun={(run) => (heartbeatRun = run)}
-		/>
-	{:else if kind === "concurrency"}
-		<!-- Per-provider concurrency limits + live status. GLOBAL (not workspace- or
-		     conversation-scoped), so the panel stays mounted across tab switches. -->
-		<ConcurrencyView
-			models={store.models}
-			loadLimits={loadConcurrencyLimits}
-			saveLimit={saveConcurrencyLimit}
-			deleteLimit={deleteConcurrencyLimit}
-			loadStatus={loadConcurrencyStatus}
-			saveCooldown={saveConcurrencyCooldown}
-		/>
-	{/if}
-{/snippet}
diff --git a/src/app/register-views.ts b/src/app/register-views.ts
new file mode 100644
index 0000000..5b462fe
--- /dev/null
+++ b/src/app/register-views.ts
@@ -0,0 +1,79 @@
+/**
+ * Built-in view registration — the composition root's view vocabulary.
+ *
+ * One thin wrapper component per existing view (src/app/views/*.svelte), each
+ * closing over exactly the props/ports App.svelte's `viewContent` snippet used
+ * to pass — INCLUDING each view's `{#key}` remount semantics (moved INSIDE the
+ * wrappers). Registry ids match the old `viewKinds` ids exactly: no
+ * user-facing renaming, no persistence-key changes.
+ *
+ * `chat` / `composer` / `message-queue` are CONTENT views (decision 5): they
+ * register with `panelEligible: false` so they never appear in the panel
+ * dropdowns. All 14 sidebar views keep the eligible default.
+ *
+ * Imported ONCE by App.svelte's module script — before any tile renders.
+ */
+
+import type { Component } from "svelte";
+import { registerView, type ViewComponent, type ViewRegistration } from "../features/layout";
+import type { AppViewPorts } from "./view-ports";
+import CacheWarmingPane from "./views/CacheWarmingPane.svelte";
+import ChatPane from "./views/ChatPane.svelte";
+import CompactionPane from "./views/CompactionPane.svelte";
+import ComposerPane from "./views/ComposerPane.svelte";
+import ConcurrencyPane from "./views/ConcurrencyPane.svelte";
+import ExtensionsPane from "./views/ExtensionsPane.svelte";
+import HeartbeatPane from "./views/HeartbeatPane.svelte";
+import LspPane from "./views/LspPane.svelte";
+import McpPane from "./views/McpPane.svelte";
+import MessageQueuePane from "./views/MessageQueuePane.svelte";
+import ModelPane from "./views/ModelPane.svelte";
+import NamedAgentsPane from "./views/NamedAgentsPane.svelte";
+import SettingsPane from "./views/SettingsPane.svelte";
+import SystemPromptPane from "./views/SystemPromptPane.svelte";
+import TabsPane from "./views/TabsPane.svelte";
+import TasksPane from "./views/TasksPane.svelte";
+import VisionPane from "./views/VisionPane.svelte";
+
+/**
+ * Every wrapper takes `{ ports: AppViewPorts }` and TileLeaf supplies it — but
+ * the registry is a HETEROGENEOUS bag of components (generic `Component`), so
+ * the composition root bridges each wrapper's concrete props type to the
+ * registry's opaque one. ONE controlled cast at this seam (the renderer always
+ * passes the port bag; the wrappers re-narrow it) instead of `any` in the
+ * contract.
+ */
+type WrapperComponent = Component<{ ports: AppViewPorts }>;
+function asView(component: WrapperComponent): ViewComponent {
+  return component as unknown as ViewComponent;
+}
+
+export function registerBuiltinViews(): void {
+  const views: readonly ViewRegistration[] = [
+    // --- sidebar views (panel-eligible by default — the 14 old viewKinds)
+    { id: "tabs", label: "Tabs", component: asView(TabsPane) },
+    { id: "model", label: "Model", component: asView(ModelPane) },
+    { id: "named-agents", label: "Named Agents", component: asView(NamedAgentsPane) },
+    { id: "lsp", label: "Language Servers", component: asView(LspPane) },
+    { id: "mcp", label: "MCP Servers", component: asView(McpPane) },
+    { id: "extensions", label: "Extensions", component: asView(ExtensionsPane) },
+    { id: "cache-warming", label: "Cache Warming", component: asView(CacheWarmingPane) },
+    { id: "tasks", label: "Tasks", component: asView(TasksPane) },
+    { id: "compaction", label: "Compaction", component: asView(CompactionPane) },
+    { id: "vision", label: "Vision", component: asView(VisionPane) },
+    { id: "heartbeat", label: "Heartbeat", component: asView(HeartbeatPane) },
+    { id: "concurrency", label: "Concurrency", component: asView(ConcurrencyPane) },
+    { id: "system-prompt", label: "System Prompt", component: asView(SystemPromptPane) },
+    { id: "settings", label: "Settings", component: asView(SettingsPane) },
+    // --- content views (never in the panel dropdowns — decision 5)
+    { id: "chat", label: "Chat", component: asView(ChatPane), panelEligible: false },
+    { id: "composer", label: "Composer", component: asView(ComposerPane), panelEligible: false },
+    {
+      id: "message-queue",
+      label: "Message Queue",
+      component: asView(MessageQueuePane),
+      panelEligible: false,
+    },
+  ];
+  for (const view of views) registerView(view);
+}
diff --git a/src/app/view-ports.ts b/src/app/view-ports.ts
new file mode 100644
index 0000000..577fe11
--- /dev/null
+++ b/src/app/view-ports.ts
@@ -0,0 +1,54 @@
+/**
+ * The port bag the composition root hands to every registered view wrapper.
+ *
+ * This is the ONLY shape of app state the wrappers may touch: the app store
+ * plus the two chrome ports that live outside the tree (the system-prompt
+ * builder modal and the heartbeat run modal). Keeping it here is what makes
+ * `register-views.ts` possible — the wrappers take `{ ports }` and close over
+ * exactly what `viewContent` used to pass in App.svelte.
+ */
+
+import { tick } from "svelte";
+import type { HeartbeatRunView } from "../features/heartbeat";
+import type { AppStore } from "./store.svelte";
+
+/**
+ * The chat transcript's live scroll element, shared with views that must
+ * preserve the reader's viewport across a prepend (today: the settings view's
+ * chat-limit save — the same mechanism as "show earlier"). The chat pane writes
+ * it on mount via an effect; nothing else may.
+ */
+export interface ChatViewportBridge {
+  el: HTMLElement | null;
+}
+
+export interface AppViewPorts {
+  readonly store: AppStore;
+  readonly chatViewport: ChatViewportBridge;
+  /** Chrome: open the system-prompt builder modal (app shell state, not a view). */
+  readonly openSystemPromptBuilder: () => void;
+  /** Chrome: open the heartbeat run modal for a run (app shell state, not a view). */
+  readonly openHeartbeatRun: (run: HeartbeatRunView) => void;
+}
+
+/**
+ * Run an async action that PREPENDS transcript content while preserving the
+ * reader's viewport position: prepended content grows scrollHeight, so shift
+ * scrollTop by the growth (the manual analogue of CSS scroll anchoring, which
+ * not every engine applies here). Used by "show earlier" AND the chat-limit
+ * save (which refills older history on a raise).
+ */
+export async function preserveViewportAcross<T>(
+  el: HTMLElement | null | undefined,
+  run: () => Promise<T>,
+): Promise<T> {
+  const prevHeight = el?.scrollHeight ?? 0;
+  const prevTop = el?.scrollTop ?? 0;
+  const result = await run();
+  await tick();
+  if (el) {
+    const delta = el.scrollHeight - prevHeight;
+    if (delta > 0) el.scrollTop = prevTop + delta;
+  }
+  return result;
+}
diff --git a/src/app/views/CacheWarmingPane.svelte b/src/app/views/CacheWarmingPane.svelte
new file mode 100644
index 0000000..d1d9b43
--- /dev/null
+++ b/src/app/views/CacheWarmingPane.svelte
@@ -0,0 +1,37 @@
+<script lang="ts">
+  /**
+   * The `cache-warming` view — the backend's conversation-scoped cache-warming
+   * surface with the WarmNow adapter. Re-mounts per conversation (like
+   * ChatView) so the view's local warming history / manual-warm feedback
+   * can't bleed across tabs (the {#key} moved inside the wrapper).
+   */
+  import { CacheWarmingView, type WarmFeedback } from "../../features/cache-warming";
+  import type { AppViewPorts } from "../view-ports";
+
+  const CACHE_WARMING_ID = "cache-warming";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  // Adapt the store's WarmResult to the cache-warming feature's WarmNow port.
+  async function warmNow(): Promise<WarmFeedback | null> {
+    const result = await store.warmNow();
+    if (result === null) return null;
+    return result.ok
+      ? {
+          ok: true,
+          cachePct: result.response.cachePct,
+          expectedCacheRate: result.response.expectedCacheRate,
+        }
+      : { ok: false, error: result.error };
+  }
+</script>
+
+{#key store.activeConversationId}
+  <CacheWarmingView
+    spec={store.surface(CACHE_WARMING_ID)}
+    canWarm={store.activeConversationId !== null}
+    onInvoke={(msg) => store.invoke(msg.surfaceId, msg.actionId, msg.payload)}
+    {warmNow}
+  />
+{/key}
diff --git a/src/app/views/ChatPane.svelte b/src/app/views/ChatPane.svelte
new file mode 100644
index 0000000..1c04b9f
--- /dev/null
+++ b/src/app/views/ChatPane.svelte
@@ -0,0 +1,91 @@
+<script lang="ts">
+  /**
+   * The `chat` view — the transcript region that moved out of App.svelte with
+   * ALL of its coupling: the smart-scroll controller (created here, reset on
+   * conversation switch like today's reset effect), the unload-gate attach
+   * effect, the follow-bottom effect, "show earlier" with viewport
+   * preservation, the ScrollToBottom affordance, and the empty-state
+   * watermark. Keyed on the active conversation exactly like today's ChatView.
+   */
+  import { ChatView } from "../../features/chat";
+  import { createSmartScrollController, ScrollToBottom } from "../../features/smart-scroll";
+  import { preserveViewportAcross, type AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  // One controller owns the chat scroll region; the effects below feed it the
+  // edges (identical to the App.svelte wiring this moved out of).
+  const smartScroll = createSmartScrollController();
+  let transcriptEl = $state<HTMLElement | undefined>();
+  let transcriptContentEl = $state<HTMLElement | undefined>();
+
+  // The settings view's chat-limit save preserves the reader's viewport over
+  // the history refill — share the live scroll element through the bridge.
+  $effect(() => {
+    ports.chatViewport.el = transcriptEl ?? null;
+  });
+
+  // Chat-limit unload gate: old chunks may be unloaded only while the reader is
+  // stuck to the bottom. While stuck, a trim removes content far ABOVE the
+  // viewport and the controller re-pins to the bottom — no visible jump; while
+  // reading history, trimming is deferred instead of yanking the page (the old
+  // Dispatch bug). In an $effect so a swapped store prop would be re-wired.
+  $effect(() => {
+    store.attachUnloadGate(() => smartScroll.isAtBottom());
+  });
+
+  // "Show earlier messages": page older history back in, preserving the reader's
+  // viewport position.
+  async function handleShowEarlier(): Promise<void> {
+    await preserveViewportAcross(transcriptEl, () => store.activeChat.showEarlier());
+  }
+
+  // Attach/detach the controller to the live scroll element + content (disposed
+  // on unmount). The content element is observed (ResizeObserver) so the view
+  // follows height changes that aren't a transcript append.
+  $effect(() => {
+    if (!transcriptEl) return;
+    return smartScroll.attach(transcriptEl, transcriptContentEl);
+  });
+
+  // New transcript content streamed in (or messages loaded) → follow the bottom
+  // while stuck. Reads `chunks.length` so the effect re-runs on every append.
+  $effect(() => {
+    void store.activeChat.chunks.length;
+    smartScroll.contentChanged();
+  });
+
+  // Conversation/tab switch → snap to the bottom of the new transcript.
+  $effect(() => {
+    void store.activeConversationId;
+    smartScroll.reset();
+  });
+</script>
+
+<div class="relative h-full pr-4">
+  <div bind:this={transcriptEl} class="h-full overflow-y-auto">
+    <div bind:this={transcriptContentEl}>
+      {#key store.activeConversationId}
+        <ChatView
+          chunks={store.activeChat.chunks}
+          turnMetrics={store.activeChat.turnMetrics}
+          hasEarlier={store.activeChat.hasEarlier}
+          onShowEarlier={handleShowEarlier}
+          thinkingKeyBase={store.activeChat.thinkingKeyBase}
+          providerRetry={store.activeChat.providerRetry}
+          apiBaseUrl={store.httpBase}
+        />
+      {/key}
+    </div>
+  </div>
+  {#if store.activeChat.chunks.length === 0}
+    <div
+      class="pointer-events-none absolute inset-0 flex items-center justify-center"
+      aria-hidden="true"
+    >
+      <span class="select-none text-4xl font-bold opacity-10">Dispatch</span>
+    </div>
+  {/if}
+  <ScrollToBottom show={smartScroll.showButton} onResume={() => smartScroll.resume()} />
+</div>
diff --git a/src/app/views/CompactionPane.svelte b/src/app/views/CompactionPane.svelte
new file mode 100644
index 0000000..ff31f0b
--- /dev/null
+++ b/src/app/views/CompactionPane.svelte
@@ -0,0 +1,48 @@
+<script lang="ts">
+  /**
+   * The `compaction` view — message compaction with the store adapters.
+   * Per-conversation (keyed so the percent + feedback can't bleed across tabs;
+   * the {#key} moved inside the wrapper).
+   */
+  import {
+    CompactionView,
+    type CompactNowResult,
+    type SaveCompactPercentResult,
+  } from "../../features/chat";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  // Adapt the store's compact result to the compaction view's port.
+  async function compactNow(): Promise<CompactNowResult | null> {
+    const result = await store.compactNow();
+    if (result === null) return null;
+    return result.ok
+      ? {
+          ok: true,
+          messagesSummarized: result.response.messagesSummarized,
+          messagesKept: result.response.messagesKept,
+        }
+      : { ok: false, error: result.error };
+  }
+
+  async function saveCompactPercent(
+    percent: number,
+  ): Promise<SaveCompactPercentResult | null> {
+    const result = await store.setCompactPercent(percent);
+    if (result === null) return null;
+    return result.ok
+      ? { ok: true, percent: result.percent }
+      : { ok: false, error: result.error };
+  }
+</script>
+
+{#key store.currentConversationId}
+  <CompactionView
+    percent={store.compactPercent}
+    canCompact={store.activeConversationId !== null}
+    {compactNow}
+    savePercent={saveCompactPercent}
+  />
+{/key}
diff --git a/src/app/views/ComposerPane.svelte b/src/app/views/ComposerPane.svelte
new file mode 100644
index 0000000..dcd5b47
--- /dev/null
+++ b/src/app/views/ComposerPane.svelte
@@ -0,0 +1,35 @@
+<script lang="ts">
+  /**
+   * The `composer` view — the send box with the status derivation that used to
+   * live in App.svelte (error > queued > running > idle) and the
+   * send/queue/stop ports. Not conversation-scoped (no {#key}) — the composer
+   * is a persistent column fixture, exactly like today.
+   */
+  import { Composer, type ComposerStatus } from "../../features/chat";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  // Priority: error > queued > running > idle. `queued` (the turn is in flight
+  // but waiting for a concurrency slot — CR-13) wins over `running` so the
+  // corner shows a ring, not dots, during the wait. `turn-start` fires before
+  // the slot is granted, so `generating` is already true while
+  // `conversationStatus === "queued"`; the explicit queued check is what
+  // distinguishes the two.
+  const composerStatus = $derived.by<ComposerStatus>(() => {
+    if (store.activeChat.error) return "error";
+    const id = store.activeConversationId;
+    if (id !== null && store.conversationStatus(id) === "queued") return "queued";
+    return store.activeChat.generating ? "running" : "idle";
+  });
+</script>
+
+<Composer
+  onSend={(text, images) => store.send(text, images)}
+  onQueue={(text) => store.queueMessage(text)}
+  onStop={() => store.stopGeneration()}
+  contextSize={store.activeChat.currentContextSize}
+  contextWindow={store.modelInfo[store.activeModel]?.contextWindow}
+  status={composerStatus}
+/>
diff --git a/src/app/views/ConcurrencyPane.svelte b/src/app/views/ConcurrencyPane.svelte
new file mode 100644
index 0000000..d04307f
--- /dev/null
+++ b/src/app/views/ConcurrencyPane.svelte
@@ -0,0 +1,39 @@
+<script lang="ts">
+  /**
+   * The `concurrency` view — per-provider concurrency limits + live status.
+   * GLOBAL (not workspace- or conversation-scoped), so the panel stays mounted
+   * across tab switches (no {#key}, like today).
+   */
+  import {
+    ConcurrencyView,
+    type DeleteConcurrencyLimit,
+    type LoadConcurrencyLimits,
+    type LoadConcurrencyStatus,
+    type SaveConcurrencyCooldown,
+    type SaveConcurrencyLimit,
+  } from "../../features/concurrency";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  // Thin passthroughs (kept for structural consistency — AGENTS.md "contracts
+  // are the cross-unit surface").
+  const loadConcurrencyLimits: LoadConcurrencyLimits = () => store.concurrencyLimits();
+  const saveConcurrencyLimit: SaveConcurrencyLimit = (providerId, limit) =>
+    store.setConcurrencyLimit(providerId, limit);
+  const deleteConcurrencyLimit: DeleteConcurrencyLimit = (providerId) =>
+    store.deleteConcurrencyLimit(providerId);
+  const loadConcurrencyStatus: LoadConcurrencyStatus = () => store.concurrencyStatus();
+  const saveConcurrencyCooldown: SaveConcurrencyCooldown = (providerId, cooldownMs) =>
+    store.setConcurrencyCooldown(providerId, cooldownMs);
+</script>
+
+<ConcurrencyView
+  models={store.models}
+  loadLimits={loadConcurrencyLimits}
+  saveLimit={saveConcurrencyLimit}
+  deleteLimit={deleteConcurrencyLimit}
+  loadStatus={loadConcurrencyStatus}
+  saveCooldown={saveConcurrencyCooldown}
+/>
diff --git a/src/app/views/ExtensionsPane.svelte b/src/app/views/ExtensionsPane.svelte
new file mode 100644
index 0000000..7a2343e
--- /dev/null
+++ b/src/app/views/ExtensionsPane.svelte
@@ -0,0 +1,78 @@
+<script lang="ts">
+  /**
+   * The `extensions` view — the frontend-modules table (aggregated from each
+   * feature's public `manifest` so it can't drift from what's actually
+   * composed) plus the generic surface list. The backend's "Loaded Extensions"
+   * surface is a SEPARATE, backend-owned list. Unkeyed (like today).
+   */
+  import Table from "../../components/Table.svelte";
+  import { manifest as cacheWarmingManifest } from "../../features/cache-warming";
+  import { manifest as chatManifest } from "../../features/chat";
+  import { manifest as concurrencyManifest } from "../../features/concurrency";
+  import { manifest as conversationCacheManifest } from "../../features/conversation-cache";
+  import { manifest as cwdLspManifest } from "../../features/cwd-lsp";
+  import { manifest as computerManifest } from "../../features/computer";
+  import { manifest as heartbeatManifest } from "../../features/heartbeat";
+  import { manifest as layoutManifest } from "../../features/layout";
+  import { manifest as markdownManifest } from "../../features/markdown";
+  import { manifest as mcpManifest } from "../../features/mcp";
+  import { manifest as namedAgentsManifest } from "../../features/named-agents";
+  import { manifest as settingsManifest } from "../../features/settings";
+  import { manifest as smartScrollManifest } from "../../features/smart-scroll";
+  import { SurfaceView } from "../../features/surface-host";
+  import { manifest as surfaceHostManifest } from "../../features/surface-host";
+  import { manifest as systemPromptManifest } from "../../features/system-prompt";
+  import { manifest as tabsManifest } from "../../features/tabs";
+  import { manifest as viewsManifest } from "../../features/views";
+  import { manifest as visionManifest } from "../../features/vision";
+  import type { AppViewPorts } from "../view-ports";
+
+  // Surfaces with dedicated renderers elsewhere stay out of the generic list:
+  // cache-warming (its own view), message-queue (its own view), todo (the
+  // Tasks view). SurfaceView itself stays fully generic (it never switches on
+  // a surface id) — the FILTER is this view's data selection.
+  const CACHE_WARMING_ID = "cache-warming";
+  const MESSAGE_QUEUE_ID = "message-queue";
+  const TODO_ID = "todo";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  const MODULE_COLUMNS = ["Module", "Description"] as const;
+  // FE features are internal units of this single repo, so there is no
+  // per-module version — they all share dispatch-web's version.
+  const loadedModules: readonly (readonly [string, string])[] = [
+    chatManifest,
+    tabsManifest,
+    surfaceHostManifest,
+    viewsManifest,
+    layoutManifest,
+    conversationCacheManifest,
+    markdownManifest,
+    cacheWarmingManifest,
+    cwdLspManifest,
+    mcpManifest,
+    computerManifest,
+    smartScrollManifest,
+    settingsManifest,
+    systemPromptManifest,
+    heartbeatManifest,
+    concurrencyManifest,
+    visionManifest,
+    namedAgentsManifest,
+  ].map((m) => [m.name, m.description] as const);
+</script>
+
+<section>
+  <h3 class="mb-1 text-xs font-semibold uppercase opacity-60">Frontend modules</h3>
+  <Table columns={MODULE_COLUMNS} rows={loadedModules} />
+</section>
+<section class="mt-4 flex flex-col gap-3">
+  <h3 class="text-xs font-semibold uppercase opacity-60">Surfaces</h3>
+  {#each store.surfaces.filter((s) => s.id !== CACHE_WARMING_ID && s.id !== MESSAGE_QUEUE_ID && s.id !== TODO_ID) as spec (spec.id)}
+    <SurfaceView
+      {spec}
+      onInvoke={(msg) => store.invoke(msg.surfaceId, msg.actionId, msg.payload)}
+    />
+  {/each}
+</section>
diff --git a/src/app/views/HeartbeatPane.svelte b/src/app/views/HeartbeatPane.svelte
new file mode 100644
index 0000000..1bb2e86
--- /dev/null
+++ b/src/app/views/HeartbeatPane.svelte
@@ -0,0 +1,56 @@
+<script lang="ts">
+  /**
+   * The `heartbeat` view — workspace-scoped autonomous-agent heartbeat (config
+   * + run history) with the store adapters. Opening a RUN raises the chrome
+   * port: the run modal is app shell state (outside the tree — layout-00
+   * decision 2). Unkeyed; the config + runs are per-workspace (like today).
+   */
+  import {
+    HeartbeatView,
+    type HeartbeatConfigResult,
+    type HeartbeatNextRunResult,
+    type HeartbeatRunView,
+    type HeartbeatRunsResult,
+    type HeartbeatStopResult,
+  } from "../../features/heartbeat";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  // Thin passthroughs (kept for structural consistency with cwd-lsp/mcp —
+  // AGENTS.md "contracts are the cross-unit surface").
+  async function loadHeartbeatConfig(): Promise<HeartbeatConfigResult> {
+    return store.heartbeatConfig();
+  }
+
+  async function saveHeartbeatConfig(
+    patch: Parameters<typeof store.setHeartbeatConfig>[0],
+  ): Promise<HeartbeatConfigResult> {
+    return store.setHeartbeatConfig(patch);
+  }
+
+  async function loadHeartbeatRuns(): Promise<HeartbeatRunsResult> {
+    return store.heartbeatRuns();
+  }
+
+  async function stopHeartbeatRun(runId: string): Promise<HeartbeatStopResult> {
+    return store.stopHeartbeatRun(runId);
+  }
+
+  async function loadHeartbeatNextRun(): Promise<HeartbeatNextRunResult> {
+    return store.heartbeatNextRun();
+  }
+</script>
+
+<HeartbeatView
+  models={store.models}
+  loadConfig={loadHeartbeatConfig}
+  saveConfig={saveHeartbeatConfig}
+  loadRuns={loadHeartbeatRuns}
+  stopRun={stopHeartbeatRun}
+  loadVariables={() => store.loadSystemPromptVariables()}
+  loadDefaultPrompt={() => store.loadSystemPrompt()}
+  loadNextRun={loadHeartbeatNextRun}
+  onOpenRun={(run) => ports.openHeartbeatRun(run)}
+/>
diff --git a/src/app/views/LspPane.svelte b/src/app/views/LspPane.svelte
new file mode 100644
index 0000000..5645ace
--- /dev/null
+++ b/src/app/views/LspPane.svelte
@@ -0,0 +1,24 @@
+<script lang="ts">
+  /**
+   * The `lsp` view — loaded language servers per conversation. Re-mounts per
+   * conversation (incl. draft) so the loaded server list is isolated (the
+   * {#key} moved inside the wrapper).
+   */
+  import { LspStatusView, type LspStatusResult } from "../../features/cwd-lsp";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  async function loadLspStatus(): Promise<LspStatusResult | null> {
+    const result = await store.lspStatus();
+    if (result === null) return null;
+    return result.ok
+      ? { ok: true, cwd: result.response.cwd, servers: result.response.servers }
+      : { ok: false, error: result.error };
+  }
+</script>
+
+{#key store.currentConversationId}
+  <LspStatusView cwd={store.cwd} canView={true} load={loadLspStatus} />
+{/key}
diff --git a/src/app/views/McpPane.svelte b/src/app/views/McpPane.svelte
new file mode 100644
index 0000000..82e139d
--- /dev/null
+++ b/src/app/views/McpPane.svelte
@@ -0,0 +1,24 @@
+<script lang="ts">
+  /**
+   * The `mcp` view — loaded MCP servers per conversation. Re-mounts per
+   * conversation (incl. draft) so the loaded server list is isolated (the
+   * {#key} moved inside the wrapper).
+   */
+  import { McpStatusView, type McpStatusResult } from "../../features/mcp";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  async function loadMcpStatus(): Promise<McpStatusResult | null> {
+    const result = await store.mcpStatus();
+    if (result === null) return null;
+    return result.ok
+      ? { ok: true, cwd: result.response.cwd, servers: result.response.servers }
+      : { ok: false, error: result.error };
+  }
+</script>
+
+{#key store.currentConversationId}
+  <McpStatusView cwd={store.cwd} canView={true} load={loadMcpStatus} />
+{/key}
diff --git a/src/app/views/MessageQueuePane.svelte b/src/app/views/MessageQueuePane.svelte
new file mode 100644
index 0000000..46b9a22
--- /dev/null
+++ b/src/app/views/MessageQueuePane.svelte
@@ -0,0 +1,40 @@
+<script lang="ts">
+  /**
+   * The `message-queue` view — pending steering messages, rendered via the
+   * generic SurfaceView (dispatches on rendererId, never surface id). The
+   * non-empty conditional moved INSIDE the view (decision 4): the tree's leaf
+   * always exists; an idle queue renders NOTHING.
+   */
+  import { SurfaceView } from "../../features/surface-host";
+  import { parseMessageQueuePayload } from "../../features/surface-host/logic/message-queue";
+  import type { AppViewPorts } from "../view-ports";
+
+  // The message-queue extension's per-conversation surface (steering). Pulled
+  // out of the generic Extensions list — pending steering messages are tied to
+  // the chat, not the sidebar.
+  const MESSAGE_QUEUE_ID = "message-queue";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  // The surface spec + whether it currently has pending messages.
+  const messageQueueSpec = $derived(store.surface(MESSAGE_QUEUE_ID));
+  const hasQueuedMessages = $derived.by(() => {
+    const spec = messageQueueSpec;
+    if (spec === null) return false;
+    const field = spec.fields.find((f) => f.kind === "custom" && f.rendererId === MESSAGE_QUEUE_ID);
+    if (field === undefined || field.kind !== "custom") return false;
+    const data = parseMessageQueuePayload(field.payload);
+    return data !== null && data.messages.length > 0;
+  });
+</script>
+
+{#if hasQueuedMessages && messageQueueSpec !== null}
+  <div class="px-4 pt-2">
+    <SurfaceView
+      spec={messageQueueSpec}
+      onInvoke={(msg) => store.invoke(msg.surfaceId, msg.actionId, msg.payload)}
+      onCancelQueuedMessage={(messageId) => store.cancelQueuedMessage(messageId)}
+    />
+  </div>
+{/if}
diff --git a/src/app/views/ModelPane.svelte b/src/app/views/ModelPane.svelte
new file mode 100644
index 0000000..0344e47
--- /dev/null
+++ b/src/app/views/ModelPane.svelte
@@ -0,0 +1,131 @@
+<script lang="ts">
+  /**
+   * The `model` view — the model selector + the per-conversation
+   * reasoning-effort / cwd / computer controls, with the store adapters that
+   * used to live in App.svelte. The controls re-mount per workspace
+   * conversation (the {#key} moved inside the wrapper) so inputs can't bleed
+   * across tabs — editable for a draft too.
+   */
+  import {
+    ModelSelector,
+    ReasoningEffortSelector,
+    type ThinkingSelection,
+    type ThinkingSelectionSaveResult,
+  } from "../../features/chat";
+  import { CwdField, type CwdSaveResult } from "../../features/cwd-lsp";
+  import {
+    ComputerField,
+    type ComputerSaveResult,
+    type ComputerStatusResult,
+    type LoadComputerStatus,
+    type SaveComputer,
+    type TestComputer,
+    type TestComputerResult,
+  } from "../../features/computer";
+  import type { NamedAgentSelectionSnapshot } from "../../features/named-agents";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  function handleSelectModel(model: string): void {
+    store.selectModel(model);
+  }
+
+  // A Named Agent selected in the model selector: resolve it to its raw model
+  // AND record the snapshot on the active conversation (plan §6/§7). The store
+  // persists the raw model to `/conversations/:id/model` + retains the snapshot
+  // on the tab.
+  function handleSelectNamedAgent(snapshot: NamedAgentSelectionSnapshot): void {
+    store.selectModel(snapshot.model, snapshot);
+  }
+
+  // Adapt the store's reasoning-effort + thinking results to the chat
+  // feature's combined selector port. The selector sends ONE selection ("off"
+  // or a level); the adapter fans it out to the right per-axis PUT(s). "off" is
+  // a SEPARATE signal from the effort level: it persists `thinking: false`
+  // (the umans route maps that to `reasoning_effort: "none"`), leaving the
+  // effort level untouched so an off→on toggle restores it. A level ensures
+  // thinking is ON (the level is meaningless while thinking is off) then sets
+  // the effort level.
+  async function saveThinkingSelection(
+    selection: ThinkingSelection,
+  ): Promise<ThinkingSelectionSaveResult | null> {
+    if (selection === "off") {
+      const result = await store.setThinking(false);
+      if (result === null) return null;
+      return result.ok
+        ? { ok: true, selection: "off" }
+        : { ok: false, error: result.error };
+    }
+    // A level: enable thinking first if it is currently off, then set the level.
+    if (store.thinking === false) {
+      const on = await store.setThinking(true);
+      if (on !== null && !on.ok) {
+        return { ok: false, error: on.error };
+      }
+    }
+    const result = await store.setReasoningEffort(selection);
+    if (result === null) return null;
+    return result.ok
+      ? { ok: true, selection: result.reasoningEffort }
+      : { ok: false, error: result.error };
+  }
+
+  async function saveCwd(cwd: string): Promise<CwdSaveResult | null> {
+    const result = await store.setCwd(cwd);
+    if (result === null) return null;
+    return result.ok ? { ok: true, cwd: result.cwd } : { ok: false, error: result.error };
+  }
+
+  async function saveComputer(computerId: string | null): Promise<ComputerSaveResult | null> {
+    const result = await store.setComputer(computerId);
+    if (result === null) return null;
+    return result.ok ? { ok: true, computerId: result.computerId } : { ok: false, error: result.error };
+  }
+
+  const loadComputerStatus: LoadComputerStatus = async (
+    alias: string,
+  ): Promise<ComputerStatusResult | null> => {
+    const result = await store.computerStatus(alias);
+    if (result === null) return null;
+    return result.ok ? { ok: true, status: result.response } : { ok: false, error: result.error };
+  };
+
+  const testComputer: TestComputer = async (
+    alias: string,
+  ): Promise<TestComputerResult | null> => {
+    const result = await store.testComputer(alias);
+    if (result === null) return null;
+    return result.ok ? { ok: true, response: result.response } : { ok: false, error: result.error };
+  };
+</script>
+
+<div class="flex flex-col gap-3">
+  <ModelSelector
+    models={store.models}
+    selected={store.activeModel}
+    onSelect={handleSelectModel}
+    modelInfo={store.modelInfo}
+    namedAgents={store.namedAgents}
+    namedAgentSnapshot={store.namedAgentSnapshot}
+    onSelectNamedAgent={handleSelectNamedAgent}
+    zeroProviders={store.enabledProviderCount === 0}
+  />
+  {#key store.currentConversationId}
+    <ReasoningEffortSelector
+      persistedEffort={store.reasoningEffort}
+      persistedThinking={store.thinking}
+      save={saveThinkingSelection}
+    />
+    <CwdField cwd={store.cwd} canEdit={true} save={saveCwd} />
+    <ComputerField
+      computerId={store.computerId}
+      canEdit={true}
+      computers={store.computers}
+      save={saveComputer}
+      loadStatus={loadComputerStatus}
+      test={testComputer}
+    />
+  {/key}
+</div>
diff --git a/src/app/views/NamedAgentsPane.svelte b/src/app/views/NamedAgentsPane.svelte
new file mode 100644
index 0000000..413141a
--- /dev/null
+++ b/src/app/views/NamedAgentsPane.svelte
@@ -0,0 +1,25 @@
+<script lang="ts">
+  /**
+   * The `named-agents` view — a global, collapsible sidebar view of curated
+   * presets. The store owns the list (authoritative for the model selector +
+   * agent tooling); the view drives CRUD via injected ports (auto-save).
+   * Unkeyed — the list is global (no {#key}, like today).
+   */
+  import {
+    NamedAgentsView,
+    type NamedAgentInput,
+  } from "../../features/named-agents";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  // Adapt the store's Named Agent CRUD to the named-agents feature's ports.
+  const namedAgentPorts = {
+    create: (input: NamedAgentInput) => store.createNamedAgent(input),
+    update: (id: string, input: NamedAgentInput) => store.updateNamedAgent(id, input),
+    remove: (id: string) => store.deleteNamedAgent(id),
+  };
+</script>
+
+<NamedAgentsView agents={store.namedAgents} models={store.models} ports={namedAgentPorts} />
diff --git a/src/app/views/SettingsPane.svelte b/src/app/views/SettingsPane.svelte
new file mode 100644
index 0000000..67a88ec
--- /dev/null
+++ b/src/app/views/SettingsPane.svelte
@@ -0,0 +1,34 @@
+<script lang="ts">
+  /**
+   * The `settings` view — FE-local settings (the chat limit). Not
+   * conversation-scoped (no {#key}: the chat limit is global). A chat-limit
+   * RAISE refills the active chat (prepends older history) — the reader's
+   * viewport is preserved over the prepend via the chat viewport bridge
+   * (exactly like today's saveChatLimit).
+   */
+  import { tick } from "svelte";
+  import { ChatLimitField, type ChatLimitSaveResult } from "../../features/settings";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  async function saveChatLimit(value: number): Promise<ChatLimitSaveResult> {
+    const el = ports.chatViewport.el;
+    const prevHeight = el?.scrollHeight ?? 0;
+    const prevTop = el?.scrollTop ?? 0;
+    const result = await store.setChatLimit(value);
+    await tick();
+    if (el) {
+      const delta = el.scrollHeight - prevHeight;
+      if (delta > 0) el.scrollTop = prevTop + delta;
+    }
+    return result.ok
+      ? { ok: true, chatLimit: result.chatLimit }
+      : { ok: false, error: result.error };
+  }
+</script>
+
+<div class="flex flex-col gap-3">
+  <ChatLimitField chatLimit={store.chatLimit} save={saveChatLimit} />
+</div>
diff --git a/src/app/views/SystemPromptPane.svelte b/src/app/views/SystemPromptPane.svelte
new file mode 100644
index 0000000..0fb5a11
--- /dev/null
+++ b/src/app/views/SystemPromptPane.svelte
@@ -0,0 +1,21 @@
+<script lang="ts">
+  /**
+   * The `system-prompt` view — a pointer to the global system-prompt template
+   * that opens the full-page modal editor (half template / half variable
+   * palette). The modal itself is CHROME (App shell state, outside the tree —
+   * layout-00 decision 2); this view only raises the port. Unkeyed (like
+   * today).
+   */
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+</script>
+
+<div class="flex flex-col gap-2">
+  <p class="text-xs opacity-60">
+    Edit the global system prompt template with variable placeholders. Opens a full-page editor.
+  </p>
+  <button type="button" class="btn btn-primary btn-sm" onclick={() => ports.openSystemPromptBuilder()}>
+    Open builder
+  </button>
+</div>
diff --git a/src/app/views/TabsPane.svelte b/src/app/views/TabsPane.svelte
new file mode 100644
index 0000000..f87b086
--- /dev/null
+++ b/src/app/views/TabsPane.svelte
@@ -0,0 +1,24 @@
+<script lang="ts">
+  /**
+   * The `tabs` view — the conversation tab list (moved out of the top bar into
+   * the sidebar). Re-mounts per workspace so the filtered tab set + scroll
+   * reset cleanly on a workspace switch (the {#key} moved inside the wrapper).
+   */
+  import { TabList } from "../../features/tabs";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+</script>
+
+{#key store.activeWorkspaceId}
+  <TabList
+    tabs={store.tabs}
+    activeConversationId={store.activeConversationId}
+    statusFor={(id) => store.conversationStatus(id)}
+    onSelect={(id) => store.selectTab(id)}
+    onClose={(id) => store.closeTab(id)}
+    onNewDraft={() => store.newDraft()}
+    onRename={(id, title) => store.renameTab(id, title)}
+  />
+{/key}
diff --git a/src/app/views/TasksPane.svelte b/src/app/views/TasksPane.svelte
new file mode 100644
index 0000000..6a375b3
--- /dev/null
+++ b/src/app/views/TasksPane.svelte
@@ -0,0 +1,29 @@
+<script lang="ts">
+  /**
+   * The `tasks` view — the todo extension's per-conversation task list
+   * (model-maintained, read-only). Re-mounts per conversation so the task list
+   * is isolated per conversation (the {#key} moved inside the wrapper).
+   * TodoList always reserves its fixed height (empty or full).
+   */
+  import TodoList from "../../features/surface-host/ui/TodoList.svelte";
+  import { parseTodoPayload } from "../../features/surface-host/logic/todo";
+  import type { AppViewPorts } from "../view-ports";
+
+  // The `todo` extension's per-conversation task list surface.
+  const TODO_ID = "todo";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  const todoData = $derived.by(() => {
+    const spec = store.surface(TODO_ID);
+    if (spec === null) return null;
+    const field = spec.fields.find((f) => f.kind === "custom" && f.rendererId === TODO_ID);
+    if (field === undefined || field.kind !== "custom") return null;
+    return parseTodoPayload(field.payload);
+  });
+</script>
+
+{#key store.activeConversationId}
+  <TodoList payload={todoData} />
+{/key}
diff --git a/src/app/views/VisionPane.svelte b/src/app/views/VisionPane.svelte
new file mode 100644
index 0000000..5d53545
--- /dev/null
+++ b/src/app/views/VisionPane.svelte
@@ -0,0 +1,45 @@
+<script lang="ts">
+  /**
+   * The `vision` view — global vision settings (image-compaction limit +
+   * model) with the store adapters. Not conversation-scoped (no {#key}), so
+   * the settings stay mounted across tab switches (like today).
+   */
+  import {
+    VisionSettingsView,
+    type LoadVisionSettingsResult,
+    type SaveVisionSettingsResult,
+    type VisionSettingsPatch,
+  } from "../../features/vision";
+  import type { AppViewPorts } from "../view-ports";
+
+  let { ports }: { ports: AppViewPorts } = $props();
+  const store = $derived(ports.store);
+
+  // Adapt the store's global vision-settings API to the vision feature's ports.
+  async function loadVisionSettings(): Promise<LoadVisionSettingsResult> {
+    // The store seeds `visionSettings` on boot; a refresh keeps it current.
+    await store.refreshVisionSettings();
+    const settings = store.visionSettings;
+    if (settings === null) {
+      return { ok: false, error: "Vision settings not available." };
+    }
+    return { ok: true, settings };
+  }
+
+  async function saveVisionSettings(
+    patch: VisionSettingsPatch,
+  ): Promise<SaveVisionSettingsResult> {
+    const result = await store.setVisionSettings(patch);
+    if (result === null) return { ok: false, error: "Vision settings not available." };
+    return result.ok
+      ? { ok: true, settings: result.settings }
+      : { ok: false, error: result.error };
+  }
+</script>
+
+<VisionSettingsView
+  models={store.models}
+  modelInfo={store.modelInfo}
+  load={loadVisionSettings}
+  save={saveVisionSettings}
+/>
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