Add minimal stock listing app: actions, Postgres schema, stocks page, Claude Agent SDK harness

- Add stocks table (server/db) with list/get/add/update/delete actions, scoped
  per user, backing both the chat agent and the /stocks UI via
  useActionQuery/useActionMutation
- Add mobile-first /stocks page (shadcn table/cards, watchlist, search) and
  wire it into the sidebar, navigation state, and view-screen context
- Install the platform's Claude Agent SDK harness (server/plugins,
  server/routes/api/claude-agent) so the app agent runs on the platform's own
  Claude subscription instead of the Builder.io gateway; fix the vendored
  turn.post.ts route to resolve the session and wrap it in
  runWithRequestContext, since custom /api/ routes aren't auto-wrapped in
  request context the way /_agent-native/actions/* are
- Add shadcn table/badge/dialog/select components (Tabler icons, not lucide)

package.json

@@ -16,18 +16,19 @@
   "dependencies": {
     "@agent-native/core": "0.129.1",
     "@agent-native/toolkit": "^0.10.11",
+    "@anthropic-ai/claude-agent-sdk": "^0.3.220",
     "@fontsource-variable/inter": "^5.2.8",
     "@libsql/client": "^0.15.8",
+    "@react-router/dev": "8.1.0",
+    "@react-router/fs-routes": "8.1.0",
     "@tabler/icons-react": "^3.41.1",
     "h3": "^2.0.1-rc.20",
     "isbot": "^5",
     "node-pty": "^1.1.0",
-    "zod": "^4.4.3",
     "postgres": "^3.4.9",
-    "@react-router/dev": "8.1.0",
-    "@react-router/fs-routes": "8.1.0",
     "react-router": "8.1.0",
-    "vite": "8.1.0"
+    "vite": "8.1.0",
+    "zod": "^4.4.3"
   },
   "devDependencies": {
     "@radix-ui/react-accordion": "^1.2.12",