fix(e2e/tanstackstart-react): Pin @tanstack/start-plugin-core to 1.167.35

@tanstack/start-plugin-core@1.168.0 (published 2026-04-24) declares
@rsbuild/core as a peer dependency but statically imports it at the
top of dist/esm/rsbuild/planning.js. When building with vite (not
rsbuild), Node fails to resolve the import and vite.config.ts load
crashes before any test runs.

Pin via pnpm.overrides until TanStack fixes the upstream package.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: logaretm

dev-packages/e2e-tests/test-applications/tanstackstart-react/package.json

@@ -45,6 +45,11 @@
   "volta": {
     "extends": "../../package.json"
   },
+  "pnpm": {
+    "overrides": {
+      "@tanstack/start-plugin-core": "1.167.35"
+    }
+  },
   "sentryTest": {
     "variants": [
       {