fix(core-eslint): activate React rules-of-hooks for all TSX surfaces

next.js and react-internal.js are plain re-exports of base, so no
rules-of-hooks checking was active anywhere despite three React apps
and core-ui. Wire eslint-plugin-react-hooks in base.js scoped to
**/*.tsx (non-React packages untouched). Fixes the one violation it
surfaced: web-tanstack's root route called Route.useLoaderData inside
an anonymous component callback — extracted to a named RootComponent.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/core-eslint/package.json

@@ -19,6 +19,7 @@
     "eslint": "^9.20.0",
     "eslint-config-prettier": "^10.1.0",
     "eslint-plugin-boundaries": "^4.2.2",
+    "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-turbo": "^2.4.0",
     "typescript-eslint": "^8.25.0",
     "vitest": "^3.1.0"