feat: workspaces shell + cwd-lsp rename + mcp/settings/system-prompt features + app wiring

- workspaces: URL-driven conversation grouping (home listing at /, routing,
  store, http adapter, WorkspaceCard) wired into the App.svelte shell
- rename features/workspace -> features/cwd-lsp (the cwd/lsp status feature)
- new features: mcp (status view), settings (chat-limit field), system-prompt
  (prompt builder), all rendered via the generic surface host
- chat: store + ChatView updates
- tabs: tabs-store updates
- app wiring: ErrorModal (full-screen error surface), app/App.svelte + store.svelte

This commit makes HEAD typecheck clean for the first time: the prior HEAD
(c95cc77) imported features/settings from app/App.svelte but never committed
the feature, so only the full working tree was green.

2 files changed, 0 insertions, 223 deletions

diff --git a/src/features/workspace/ui/CwdField.svelte b/src/features/workspace/ui/CwdField.svelte
deleted file mode 100644
index bd8b870..0000000
--- a/src/features/workspace/ui/CwdField.svelte
+++ /dev/null
@@ -1,96 +0,0 @@
-<script lang="ts">
-	import { untrack } from "svelte";
-	import { cwdChanged, normalizeCwd, type SaveCwd } from "../logic/view-model";
-
-	let {
-		cwd,
-		canEdit,
-		save,
-	}: {
-		/** The active conversation's persisted cwd, or null when unset. */
-		cwd: string | null;
-		/** Whether a real conversation is focused (a draft can't persist a cwd yet). */
-		canEdit: boolean;
-		save: SaveCwd;
-	} = $props();
-
-	// Start empty; the $effect below seeds from the (async-loaded) cwd prop. (Reading
-	// the prop directly into initial $state would only capture its first value.)
-	let value = $state("");
-	let lastSeed = $state("");
-	let saving = $state(false);
-	let error = $state<string | null>(null);
-	let justSaved = $state(false);
-
-	// Seed the input from the persisted cwd (it loads async). Only reseed while the
-	// field is untouched, so an in-flight load can't clobber what the user typed.
-	// Re-mounted per conversation, so there is no cross-tab bleed.
-	$effect(() => {
-		const incoming = cwd ?? "";
-		untrack(() => {
-			if (value === lastSeed) value = incoming;
-			lastSeed = incoming;
-		});
-	});
-
-	const dirty = $derived(cwdChanged(value, cwd));
-
-	async function handleSave() {
-		if (saving || !canEdit || !dirty) return;
-		saving = true;
-		error = null;
-		justSaved = false;
-		const result = await save(normalizeCwd(value));
-		saving = false;
-		if (result === null) return;
-		if (result.ok) {
-			justSaved = true;
-		} else {
-			error = result.error;
-		}
-	}
-
-	function onInput() {
-		justSaved = false;
-		error = null;
-	}
-</script>
-
-<div class="flex flex-col gap-1">
-	<span class="text-xs font-semibold uppercase opacity-60">Working directory</span>
-	<div class="flex items-center gap-2">
-		<input
-			type="text"
-			class="input input-bordered input-sm w-full font-mono text-xs"
-			placeholder={canEdit ? "/abs/path/to/project" : "Open a conversation first"}
-			bind:value
-			disabled={!canEdit || saving}
-			oninput={onInput}
-			onkeydown={(e) => {
-				if (e.key === "Enter") handleSave();
-			}}
-			aria-label="Working directory"
-		/>
-		<button
-			type="button"
-			class="btn btn-primary btn-sm"
-			disabled={!canEdit || saving || !dirty}
-			onclick={handleSave}
-		>
-			{#if saving}
-				<span class="loading loading-spinner loading-xs"></span>
-			{:else}
-				Set
-			{/if}
-		</button>
-	</div>
-	{#if !canEdit}
-		<p class="text-xs opacity-60">Start or open a conversation to set its working directory.</p>
-	{:else if error}
-		<p class="text-xs text-error">{error}</p>
-	{:else if justSaved && !dirty}
-		<p class="text-xs text-success">Saved.</p>
-	{:else}
-		<p class="text-xs opacity-50">Defaults each turn's cwd; drives the language servers below.</p>
-	{/if}
-</div>
diff --git a/src/features/workspace/ui/LspStatusView.svelte b/src/features/workspace/ui/LspStatusView.svelte
deleted file mode 100644
index 77603a1..0000000
--- a/src/features/workspace/ui/LspStatusView.svelte
+++ /dev/null
@@ -1,127 +0,0 @@
-<script lang="ts">
-	import { untrack } from "svelte";
-	import {
-		type Badge,
-		type LoadLspStatus,
-		type LspServerView,
-		summarizeServers,
-		viewLspServers,
-	} from "../logic/view-model";
-
-	let {
-		cwd,
-		canView,
-		load,
-	}: {
-		/** The active conversation's cwd — the trigger to (re)load when it changes. */
-		cwd: string | null;
-		/** Whether a real conversation is focused. */
-		canView: boolean;
-		load: LoadLspStatus;
-	} = $props();
-
-	const badgeClass: Record<Badge, string> = {
-		success: "badge-success",
-		warning: "badge-warning",
-		error: "badge-error",
-		neutral: "badge-ghost",
-	};
-
-	let servers = $state<readonly LspServerView[]>([]);
-	let loading = $state(false);
-	let error = $state<string | null>(null);
-	let loadedCwd = $state<string | null>(null);
-	let hasLoaded = $state(false);
-	let summary = $state("");
-
-	async function refresh() {
-		if (!canView) return;
-		loading = true;
-		error = null;
-		const result = await load();
-		loading = false;
-		if (result === null) return;
-		hasLoaded = true;
-		if (result.ok) {
-			servers = viewLspServers(result.servers);
-			summary = summarizeServers(result.servers);
-			loadedCwd = result.cwd;
-		} else {
-			error = result.error;
-		}
-	}
-
-	// (Re)load on mount and whenever the conversation's cwd changes. The LSP GET
-	// lazily spawns servers, so we avoid a redundant fetch when `cwd` resolves to
-	// the value we already loaded for.
-	$effect(() => {
-		const target = cwd;
-		const can = canView;
-		untrack(() => {
-			if (!can) return;
-			if (!hasLoaded || target !== loadedCwd) void refresh();
-		});
-	});
-</script>
-
-<div class="flex flex-col gap-2">
-	<div class="flex items-center justify-between gap-2">
-		<span class="text-xs opacity-70">
-			{#if loading}
-				Resolving…
-			{:else if hasLoaded && loadedCwd !== null}
-				{summary}
-			{:else}
-				Language servers
-			{/if}
-		</span>
-		<button
-			type="button"
-			class="btn btn-ghost btn-xs"
-			disabled={!canView || loading}
-			onclick={() => refresh()}
-			aria-label="Refresh language server status"
-		>
-			{#if loading}
-				<span class="loading loading-spinner loading-xs"></span>
-			{:else}
-				Refresh
-			{/if}
-		</button>
-	</div>
-
-	{#if !canView}
-		<p class="text-xs opacity-60">Open or start a conversation to see its language servers.</p>
-	{:else if error}
-		<p class="text-xs text-error">{error}</p>
-	{:else if hasLoaded && loadedCwd === null}
-		<p class="text-xs opacity-60">
-			Set a working directory in the Model panel to enable language servers.
-		</p>
-	{:else if hasLoaded && servers.length === 0 && !loading}
-		<p class="text-xs opacity-60">No language servers configured for this directory.</p>
-	{:else}
-		<ul class="flex flex-col gap-2">
-			{#each servers as server (server.id)}
-				<li class="flex flex-col gap-1 rounded-box bg-base-200 p-2 text-sm">
-					<div class="flex items-center justify-between gap-2">
-						<span class="font-medium">{server.name}</span>
-						<span class="badge badge-sm {badgeClass[server.badge]} gap-1">
-							{#if server.busy}
-								<span class="loading loading-spinner loading-xs"></span>
-							{/if}
-							{server.statusLabel}
-						</span>
-					</div>
-					{#if server.extensionsLabel}
-						<span class="font-mono text-xs opacity-60">{server.extensionsLabel}</span>
-					{/if}
-					<span class="truncate font-mono text-xs opacity-50" title={server.root}>{server.root}</span>
-					{#if server.error}
-						<span class="font-mono text-xs text-error">{server.error}</span>
-					{/if}
-				</li>
-			{/each}
-		</ul>
-	{/if}
-</div>