Fix planner production server + use .ts extensions everywhere

- Fix createRequestHandler → createRequestListener (@react-router/node
  removed the old API)
- Move noEmit + allowImportingTsExtensions to tsconfig.base.json so all
  packages and apps inherit them consistently
- Add explicit .ts extensions to all remaining relative imports across
  packages and apps

Verified locally: node --experimental-strip-types server.ts starts and
responds 200.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/ui/src/index.ts

@@ -1,6 +1,6 @@
-export { Button } from "./Button";
-export type { ButtonProps } from "./Button";
-export { Input } from "./Input";
-export type { InputProps } from "./Input";
-export { Card } from "./Card";
-export type { CardProps } from "./Card";
+export { Button } from "./Button.tsx";
+export type { ButtonProps } from "./Button.tsx";
+export { Input } from "./Input.tsx";
+export type { InputProps } from "./Input.tsx";
+export { Card } from "./Card.tsx";
+export type { CardProps } from "./Card.tsx";