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
(dfe1711) imported features/settings from app/App.svelte but never committed
the feature, so only the full working tree was green.

1 files changed, 0 insertions, 14 deletions

diff --git a/src/features/workspace/index.ts b/src/features/workspace/index.ts
deleted file mode 100644
index 9acf994..0000000
--- a/src/features/workspace/index.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-export type {
-	CwdSaveResult,
-	LoadLspStatus,
-	LspStatusResult,
-	SaveCwd,
-} from "./logic/view-model";
-export { default as CwdField } from "./ui/CwdField.svelte";
-export { default as LspStatusView } from "./ui/LspStatusView.svelte";
-
-/** Public module manifest — aggregated by the shell's "Loaded Modules" view. */
-export const manifest = {
-	name: "workspace",
-	description: "Per-conversation working directory + language-server status",
-} as const;