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, 231 deletions

diff --git a/src/features/workspace/logic/view-model.test.ts b/src/features/workspace/logic/view-model.test.ts
deleted file mode 100644
index a06edeb..0000000
--- a/src/features/workspace/logic/view-model.test.ts
+++ /dev/null
@@ -1,101 +0,0 @@
-import type { LspServerInfo } from "@dispatch/transport-contract";
-import { describe, expect, it } from "vitest";
-import {
-	cwdChanged,
-	isSubmittableCwd,
-	normalizeCwd,
-	summarizeServers,
-	viewLspServer,
-	viewLspServers,
-} from "./view-model";
-
-const server = (over: Partial<LspServerInfo> = {}): LspServerInfo => ({
-	id: "typescript",
-	name: "TypeScript",
-	root: "/home/me/project",
-	extensions: [".ts", ".tsx"],
-	state: "connected",
-	...over,
-});
-
-describe("cwd helpers", () => {
-	it("normalizeCwd trims surrounding whitespace", () => {
-		expect(normalizeCwd("  /a/b  ")).toBe("/a/b");
-		expect(normalizeCwd("\t/x\n")).toBe("/x");
-	});
-
-	it("isSubmittableCwd is false for empty / whitespace-only", () => {
-		expect(isSubmittableCwd("")).toBe(false);
-		expect(isSubmittableCwd("   ")).toBe(false);
-		expect(isSubmittableCwd("/a")).toBe(true);
-	});
-
-	it("cwdChanged: true only when a non-empty trimmed value differs from current", () => {
-		expect(cwdChanged("/a/b", null)).toBe(true);
-		expect(cwdChanged("/a/b", "/a/b")).toBe(false);
-		expect(cwdChanged("  /a/b  ", "/a/b")).toBe(false); // trim-equal → no change
-		expect(cwdChanged("/a/c", "/a/b")).toBe(true);
-		expect(cwdChanged("", "/a/b")).toBe(false); // empty is not a change (can't clear)
-		expect(cwdChanged("   ", null)).toBe(false);
-	});
-});
-
-describe("viewLspServer", () => {
-	it("connected → success badge, not busy, no error", () => {
-		const v = viewLspServer(server({ state: "connected" }));
-		expect(v.badge).toBe("success");
-		expect(v.statusLabel).toBe("Connected");
-		expect(v.busy).toBe(false);
-		expect(v.error).toBeNull();
-		expect(v.extensionsLabel).toBe(".ts .tsx");
-	});
-
-	it("starting / not-started → busy (spinner) with warning / neutral badge", () => {
-		const starting = viewLspServer(server({ state: "starting" }));
-		expect(starting.badge).toBe("warning");
-		expect(starting.busy).toBe(true);
-
-		const notStarted = viewLspServer(server({ state: "not-started" }));
-		expect(notStarted.badge).toBe("neutral");
-		expect(notStarted.busy).toBe(true);
-	});
-
-	it("error → error badge + surfaces the reason (with a fallback)", () => {
-		const withReason = viewLspServer(server({ state: "error", error: "ENOENT" }));
-		expect(withReason.badge).toBe("error");
-		expect(withReason.busy).toBe(false);
-		expect(withReason.error).toBe("ENOENT");
-
-		const noReason = viewLspServer(server({ state: "error" }));
-		expect(noReason.error).toBe("Failed to start");
-	});
-
-	it("viewLspServers maps a list preserving order", () => {
-		const views = viewLspServers([server({ id: "a" }), server({ id: "b" })]);
-		expect(views.map((v) => v.id)).toEqual(["a", "b"]);
-	});
-});
-
-describe("summarizeServers", () => {
-	it("empty list", () => {
-		expect(summarizeServers([])).toBe("No language servers");
-	});
-
-	it("counts connected / starting / errors", () => {
-		expect(summarizeServers([server({ state: "connected" })])).toBe("1 connected");
-		expect(
-			summarizeServers([
-				server({ id: "a", state: "connected" }),
-				server({ id: "b", state: "error" }),
-			]),
-		).toBe("1 connected, 1 error");
-		expect(
-			summarizeServers([
-				server({ id: "a", state: "connected" }),
-				server({ id: "b", state: "starting" }),
-				server({ id: "c", state: "error" }),
-				server({ id: "d", state: "error" }),
-			]),
-		).toBe("1 connected, 1 starting, 2 errors");
-	});
-});
diff --git a/src/features/workspace/logic/view-model.ts b/src/features/workspace/logic/view-model.ts
deleted file mode 100644
index bc9b30b..0000000
--- a/src/features/workspace/logic/view-model.ts
+++ /dev/null
@@ -1,130 +0,0 @@
-import type { LspServerInfo, LspServerState } from "@dispatch/transport-contract";
-
-/**
- * Pure core for the workspace feature — zero DOM, zero effects, zero Svelte.
- *
- * The workspace feature exposes a conversation's per-tab working directory (cwd)
- * and the live status of the language servers configured for that cwd. This
- * module holds the pure logic: cwd normalization/validation, the mapping of a
- * backend `LspServerState` to a display badge, and a one-line server summary.
- * The effects (the HTTP get/set cwd + get LSP status) are INJECTED via the ports
- * below; the composition root implements them.
- */
-
-// ── Injected ports (consumer-defines-port; the composition root adapts the
-//    store's HTTP calls to these shapes). ──────────────────────────────────────
-
-/** Outcome of `PUT /conversations/:id/cwd`; `null` when no real conversation is focused. */
-export type CwdSaveResult =
-	| { readonly ok: true; readonly cwd: string | null }
-	| { readonly ok: false; readonly error: string };
-
-export type SaveCwd = (cwd: string) => Promise<CwdSaveResult | null>;
-
-/** Outcome of `GET /conversations/:id/lsp`; `null` when no real conversation is focused. */
-export type LspStatusResult =
-	| { readonly ok: true; readonly cwd: string | null; readonly servers: readonly LspServerInfo[] }
-	| { readonly ok: false; readonly error: string };
-
-export type LoadLspStatus = () => Promise<LspStatusResult | null>;
-
-// ── cwd helpers ───────────────────────────────────────────────────────────────
-
-/** Trim surrounding whitespace; the backend rejects an empty cwd. */
-export function normalizeCwd(raw: string): string {
-	return raw.trim();
-}
-
-/** Whether a typed cwd is submittable (non-empty after trim). */
-export function isSubmittableCwd(raw: string): boolean {
-	return normalizeCwd(raw).length > 0;
-}
-
-/**
- * Whether saving `typed` would change the persisted `current` cwd. A no-op save
- * (unchanged, or empty) should be disabled.
- */
-export function cwdChanged(typed: string, current: string | null): boolean {
-	const next = normalizeCwd(typed);
-	if (next.length === 0) return false;
-	return next !== (current ?? "");
-}
-
-// ── LSP server status → display view ──────────────────────────────────────────
-
-export type Badge = "success" | "warning" | "error" | "neutral";
-
-export interface LspServerView {
-	readonly id: string;
-	readonly name: string;
-	readonly root: string;
-	/** Space-joined extension list, e.g. ".ts .tsx". */
-	readonly extensionsLabel: string;
-	readonly state: LspServerState;
-	readonly statusLabel: string;
-	readonly badge: Badge;
-	/** True while the state is transient (show a spinner). */
-	readonly busy: boolean;
-	/** The error reason when `state === "error"`, else null. */
-	readonly error: string | null;
-}
-
-/** Map a server's state to a display label + badge severity + busy flag. */
-export function viewLspServer(server: LspServerInfo): LspServerView {
-	let statusLabel: string;
-	let badge: Badge;
-	let busy = false;
-	switch (server.state) {
-		case "connected":
-			statusLabel = "Connected";
-			badge = "success";
-			break;
-		case "starting":
-			statusLabel = "Starting…";
-			badge = "warning";
-			busy = true;
-			break;
-		case "not-started":
-			statusLabel = "Not started";
-			badge = "neutral";
-			busy = true;
-			break;
-		case "error":
-			statusLabel = "Error";
-			badge = "error";
-			break;
-	}
-	return {
-		id: server.id,
-		name: server.name,
-		root: server.root,
-		extensionsLabel: server.extensions.join(" "),
-		state: server.state,
-		statusLabel,
-		badge,
-		busy,
-		error: server.state === "error" ? (server.error ?? "Failed to start") : null,
-	};
-}
-
-export function viewLspServers(servers: readonly LspServerInfo[]): readonly LspServerView[] {
-	return servers.map(viewLspServer);
-}
-
-/** A short one-line summary, e.g. "2 connected" / "1 connected, 1 error". */
-export function summarizeServers(servers: readonly LspServerInfo[]): string {
-	if (servers.length === 0) return "No language servers";
-	let connected = 0;
-	let errored = 0;
-	let pending = 0;
-	for (const s of servers) {
-		if (s.state === "connected") connected++;
-		else if (s.state === "error") errored++;
-		else pending++;
-	}
-	const parts: string[] = [];
-	if (connected > 0) parts.push(`${connected} connected`);
-	if (pending > 0) parts.push(`${pending} starting`);
-	if (errored > 0) parts.push(`${errored} error${errored === 1 ? "" : "s"}`);
-	return parts.join(", ");
-}