feat: add public entry and authenticated workspace dashboard

web/workspace/test/visual-review/empty-workspace-fixture-server.ts

@@ -11,6 +11,8 @@ import { dashboardFixture } from "../../src/lib/workspace/home/dashboard.test-fi
 
 Deno.serve({ hostname: "127.0.0.1", port }, async (request) => {
   const url = new URL(request.url);
+  if (url.pathname === "/api/auth/whoami") return Response.json({ actor: { user_id: "fixture-user", account_id: "fixture-owner", handle: "alice", display_name: "Alice", auth_method: "browser_session" } });
+  if (url.pathname === "/api/hosting/access") return Response.json({ is_admin: false });
   if (url.pathname === "/api/workspaces" && request.method === "POST") {
     return Response.json({
       message: