chore: update beads and page for unified shell

- Backed up old page.tsx to page-old.tsx
- Updated page.tsx to use UnifiedShell
- Beads updated: bb-ui2.27, bb-ui2.28 closed; new agent beads created

src/app/page-old.tsx

@@ -0,0 +1,37 @@
+import { KanbanPage } from '../components/kanban/kanban-page';
+import { readIssuesForScope } from '../lib/aggregate-read';
+import { resolveProjectScope } from '../lib/project-scope';
+import { listProjects } from '../lib/registry';
+
+interface PageProps {
+  searchParams?: Promise<Record<string, string | string[] | undefined>>;
+}
+
+export default async function Page({ searchParams }: PageProps) {
+  const params = (await searchParams) ?? {};
+  const requestedProjectKey = typeof params.project === 'string' ? params.project : null;
+  const requestedMode = typeof params.mode === 'string' ? params.mode : null;
+  const registryProjects = await listProjects();
+  const scope = resolveProjectScope({
+    currentProjectRoot: process.cwd(),
+    registryProjects,
+    requestedProjectKey,
+    requestedMode,
+  });
+
+  const issues = await readIssuesForScope({
+    mode: scope.mode,
+    selected: scope.selected,
+    scopeOptions: scope.options,
+    preferBd: true,
+  });
+  return (
+    <KanbanPage
+      issues={issues}
+      projectRoot={scope.selected.root}
+      projectScopeKey={scope.selected.key}
+      projectScopeOptions={scope.options}
+      projectScopeMode={scope.mode}
+    />
+  );
+}

src/app/page.tsx

@@ -1,4 +1,4 @@
-import { KanbanPage } from '../components/kanban/kanban-page';
+import { UnifiedShell } from '../components/shared/unified-shell';
 import { readIssuesForScope } from '../lib/aggregate-read';
 import { resolveProjectScope } from '../lib/project-scope';
 import { listProjects } from '../lib/registry';
@@ -25,8 +25,9 @@ export default async function Page({ searchParams }: PageProps) {
     scopeOptions: scope.options,
     preferBd: true,
   });
+  
   return (
-    <KanbanPage
+    <UnifiedShell
       issues={issues}
       projectRoot={scope.selected.root}
       projectScopeKey={scope.selected.key}