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.

1 files changed, 131 insertions, 0 deletions

diff --git a/src/features/mcp/ui/McpStatusView.svelte b/src/features/mcp/ui/McpStatusView.svelte
new file mode 100644
index 0000000..9ac40ba
--- /dev/null
+++ b/src/features/mcp/ui/McpStatusView.svelte
@@ -0,0 +1,131 @@
+<script lang="ts">
+	import { untrack } from "svelte";
+	import {
+		type Badge,
+		type LoadMcpStatus,
+		type McpServerView,
+		summarizeMcpServers,
+		viewMcpServers,
+	} 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: LoadMcpStatus;
+	} = $props();
+
+	const badgeClass: Record<Badge, string> = {
+		success: "badge-success",
+		warning: "badge-warning",
+		error: "badge-error",
+		neutral: "badge-ghost",
+	};
+
+	let servers = $state<readonly McpServerView[]>([]);
+	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 = viewMcpServers(result.servers);
+			summary = summarizeMcpServers(result.servers);
+			loadedCwd = result.cwd;
+		} else {
+			error = result.error;
+		}
+	}
+
+	// (Re)load on mount and whenever the conversation's cwd changes. The MCP GET
+	// lazily spawns/connects 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}
+				MCP servers
+			{/if}
+		</span>
+		<button
+			type="button"
+			class="btn btn-ghost btn-xs"
+			disabled={!canView || loading}
+			onclick={() => refresh()}
+			aria-label="Refresh MCP 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 MCP 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 MCP servers.
+		</p>
+	{:else if hasLoaded && servers.length === 0 && !loading}
+		<p class="text-xs opacity-60">No MCP 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 font-mono">{server.id}</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>
+					<div class="flex items-center justify-between gap-2 text-xs opacity-60">
+						{#if server.configSource}
+							<span class="font-mono" title="Config source">{server.configSource}</span>
+						{:else}
+							<span></span>
+						{/if}
+						<span title="Discovered tools">{server.toolCount} tool{server.toolCount === 1 ? "" : "s"}</span>
+					</div>
+					{#if server.error}
+						<span class="font-mono text-xs text-error">{server.error}</span>
+					{/if}
+				</li>
+			{/each}
+		</ul>
+	{/if}
+</div>