feat: refactor conversations page into a workbench layout and implement workspace switching

- Migrate ConversationsPage to use ConversationWorkbench component.
- Create WorkbenchLayout to handle authentication and layout for workbench.
- Add WorkbenchPage to render ConversationWorkbench.
- Implement WorkspaceSwitcher for switching between dashboard and workbench.
- Update AuthProvider to manage authentication for both dashboard and workbench routes.
- Enhance WorkbenchHeader with user menu and workspace switcher.
- Add tests for workspace switcher and auth provider functionality.
- Update translations for workspace labels in English and Chinese.
- Exclude e2e tests from TypeScript compilation.

web/components/workspace-switcher.test.mjs

@@ -0,0 +1,16 @@
+import assert from "node:assert/strict";
+import { readFile } from "node:fs/promises";
+import { describe, it } from "node:test";
+
+const source = await readFile(new URL("./workspace-switcher.tsx", import.meta.url), "utf8");
+
+describe("workspace switcher config", () => {
+  it("contains dashboard and workbench destinations", async () => {
+  assert.match(source, /key:\s*"dashboard"[\s\S]*href:\s*"\/dashboard"[\s\S]*labelKey:\s*"workspace\.dashboard"/);
+  assert.match(source, /key:\s*"workbench"[\s\S]*href:\s*"\/workbench"[\s\S]*labelKey:\s*"workspace\.workbench"/);
+});
+
+it("wraps the dropdown label in a Base UI menu group", async () => {
+  assert.match(source, /<DropdownMenuGroup>[\s\S]*<DropdownMenuLabel>\{t\("workspace\.switchWorkspace"\)\}<\/DropdownMenuLabel>/);
+});
+});