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/api/cron.ts

@@ -1,7 +1,7 @@
 import { Elysia, t } from "elysia"
 import { db } from "@/lib/db/index"
 import { storageObjects } from "@/lib/db/schema"
-import { eq, and, isNull, sql } from "drizzle-orm"
+import { eq, sql } from "drizzle-orm"
 import { deleteObject, isR2Configured } from "@/lib/storage"
 
 // ── Task Result Type ────────────────────────────────────────────────
@@ -110,21 +110,6 @@ registerCronTask("orphan_detection", async () => {
   }
 })
 
-// ── Sitemap Regeneration Task ────────────────────────────────────────
-registerCronTask("sitemap_regeneration", async () => {
-  const start = Date.now()
-  const details: Record<string, unknown> = {}
-  try {
-    const { generateSitemaps } = await import("@/lib/sitemap/generate-static")
-    await generateSitemaps()
-    details.regenerated = true
-    return { name: "sitemap_regeneration", status: "success" as const, durationMs: Date.now() - start, details }
-  } catch (err) {
-    details.error = err instanceof Error ? err.message : String(err)
-    return { name: "sitemap_regeneration", status: "error" as const, durationMs: Date.now() - start, details }
-  }
-})
-
 // ── Cron Route ──────────────────────────────────────────────────────
 export const cronRoutes = new Elysia({ prefix: "/cron" }).post(
   "/daily",