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

lib/storage/r2-client.ts

@@ -14,7 +14,6 @@ const R2_BUCKET_NAME = process.env.R2_BUCKET_NAME ?? "deckyvault"
 const R2_PUBLIC_URL = process.env.R2_PUBLIC_URL ?? ""
 
 let _client: S3Client | null = null
-let _configured = false
 
 function getR2ConfigStatus(): { configured: boolean; reason?: string } {
   if (!R2_ACCOUNT_ID || !R2_ACCESS_KEY_ID || !R2_SECRET_ACCESS_KEY) {
@@ -37,7 +36,6 @@ function getClient(): S3Client {
       secretAccessKey: R2_SECRET_ACCESS_KEY!,
     },
   })
-  _configured = true
   return _client
 }