Complete monorepo toolchain setup (tasks 1.1-1.7)

- Turborepo + pnpm workspaces with catalog for shared dependency versions
- TypeScript strict config (base + per-package extends)
- Tailwind CSS v4 via @tailwindcss/vite plugin
- ESLint + Prettier shared config
- Planner app scaffolded with React Router 7 (port 3001)
- Journal app scaffolded with React Router 7 (port 3000)
- Both apps build and start successfully via turbo

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

pnpm-workspace.yaml

@@ -1,3 +1,17 @@
 packages:
   - "apps/*"
   - "packages/*"
+
+catalog:
+  react: ^19.1.0
+  react-dom: ^19.1.0
+  react-router: ^7.6.1
+  "@react-router/dev": ^7.6.1
+  "@react-router/node": ^7.6.1
+  "@react-router/serve": ^7.6.1
+  "@types/react": ^19.1.4
+  "@types/react-dom": ^19.1.5
+  tailwindcss: ^4.1.7
+  "@tailwindcss/vite": ^4.1.7
+  typescript: ^5.8.3
+  vite: ^6.0.0