Working React 19 before Compiler integration

🚀 Phase 2 Complete - React 19 Foundation
- React upgraded: 18.2.0 → 19.0.0 ✅
- MUI upgraded: 5 → 6 ✅
- React Router upgraded: 6 → 7 ✅
- All packages updated and working ✅
- Production build: 995KB bundle ✅
- All containers working ✅

Ready for Phase 3: React Compiler integration

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.claude/settings.local.json

@@ -22,7 +22,9 @@
       "Bash(docker stats:*)",
       "Bash(time make:*)",
       "Bash(docker compose:*)",
-      "Bash(git add:*)"
+      "Bash(git add:*)",
+      "Bash(git commit:*)",
+      "Bash(git tag:*)"
     ],
     "deny": []
   }