chore(lint): add perf category to oxlint and fix resulting warnings

- Enable `perf: warn` in `.oxlintrc.json` and add `builtin` env; disable `no-await-in-loop` and `react/no-array-index-key` globally
- Reorder plugins so `oxc` is first
- Add `.oxfmtrc.json` override to suppress trailing commas in JSON/JSONC files
- Replace spread-into-new-object patterns (`{ ...x, key: val }`) with `Object.assign(x, { key: val })` in discover, explore, integrations, search, credits, and image-cache to satisfy perf rules
- Memoize `ChartContext` and `ToggleGroupContext` provider values to avoid unnecessary re-renders

packages/core/src/credits.ts

@@ -361,8 +361,7 @@ export function getCastForTitle(titleId: string): CastMember[] {
     .orderBy(titleCast.displayOrder)
     .all();
 
-  return rows.map((r) => ({
-    ...r,
-    profilePath: tmdbImageUrl(r.profilePath, "profiles"),
-  }));
+  return rows.map((r) =>
+    Object.assign(r, { profilePath: tmdbImageUrl(r.profilePath, "profiles") }),
+  );
 }

packages/core/src/image-cache.ts

@@ -146,10 +146,11 @@ export async function cacheImagesForTitle(titleId: string) {
 
   // Parallel cache checks instead of sequential awaits
   const checks = await Promise.all(
-    candidates.map(async (c) => ({
-      ...c,
-      cached: await isImageCached(c.category, path.basename(c.imgPath)),
-    })),
+    candidates.map(async (c) =>
+      Object.assign(c, {
+        cached: await isImageCached(c.category, path.basename(c.imgPath)),
+      }),
+    ),
   );
   const tasks = checks
     .filter((c) => !c.cached)