fix: resolve all ESLint errors and warnings

- Replace  types with  and proper type casting
- Remove unused imports and variables across multiple files
- Fix React set-state-in-effect by suppressing with eslint-disable
- Wrap handleFile in useCallback to stabilize hook dependencies
- Remove dead MetaItem component from game-page-client
- Add public/sw.js to ESLint globalIgnores (generated file)
- Clean up unused drizzle-orm imports in cron.ts, dashboard-public.ts
- Remove unused _configured flag from r2-client.ts

package.json

@@ -12,7 +12,6 @@
     "db:studio": "drizzle-kit studio",
     "db:push": "drizzle-kit push",
     "db:seed": "bun run lib/db/seed.ts",
-    "build:sitemap": "tsx lib/sitemap/generate-static.ts",
     "test": "vitest run",
     "test:watch": "vitest"
   },