chore: upgrade Vite to 8.0.14 and plugin-react to 6.0.2

- vite 6.4.2 to 8.0.14
- @vitejs/plugin-react 5.2.0 to 6.0.2
- Migrate optimizeDeps.esbuildOptions to rolldownOptions (Vite 8 uses rolldown)
- Remove @esbuild-plugins/node-globals-polyfill (no longer needed)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -148,7 +148,7 @@
     "@vanilla-extract/css": "1.20.1",
     "@vanilla-extract/recipes": "0.5.7",
     "@vanilla-extract/vite-plugin": "5.2.2",
-    "@vitejs/plugin-react": "5.2.0",
+    "@vitejs/plugin-react": "6.0.2",
     "buffer": "6.0.3",
     "cz-conventional-changelog": "3.3.0",
     "eslint": "8.57.1",
@@ -163,7 +163,7 @@
     "prettier": "3.8.3",
     "semantic-release": "25.0.3",
     "typescript": "6.0.3",
-    "vite": "6.4.2",
+    "vite": "8.0.14",
     "vite-plugin-pwa": "1.3.0",
     "vite-plugin-static-copy": "4.1.0"
   },