chore: make lint deny warnings

- Add --deny-warnings flag to lint script
- Update CI to also deny warnings

Note: 12 existing warnings need to be fixed.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Boshen

.github/workflows/ci.yml

@@ -45,7 +45,7 @@ jobs:
         run: vite fmt --check
 
       - name: Lint (with GitHub annotations)
-        run: vite lint --format github --type-aware --type-check
+        run: vite lint --deny-warnings --format github --type-aware --type-check
 
       - name: Run tests
         run: vite test

package.json

@@ -9,7 +9,7 @@
     "ready": "vite run fmt && vite run lint && vite run test && vite run build",
     "dev": "vite run @vibe/dashboard#dev",
     "build": "vite run @vibe/dashboard#build",
-    "lint": "vite lint --type-aware --type-check",
+    "lint": "vite lint --deny-warnings --type-aware --type-check",
     "test": "vite test",
     "fmt": "vite fmt",
     "fmt:check": "vite fmt --check",