fix(frontend): resolve all eslint warnings and errors

- block-timeline: ref updates moved to useLayoutEffect
- channel-card, guide/page: Date.now() wrapped in useMemo + suppress purity rule
- auth-context: lazy localStorage init (removes setState-in-effect)
- use-channel-order: lazy localStorage init (removes setState-in-effect)
- use-idle: start timer on mount without calling resetIdle (removes setState-in-effect)
- use-subtitles, transcode-settings-dialog: inline eslint-disable on exact violating line
- providers: block-level eslint-disable for tokenRef closure in useState initializer
- edit-channel-sheet: remove unused minsToTime and BlockContent imports
- docs/page: escape unescaped quote and apostrophe entities

k-tv-frontend/hooks/use-idle.ts

@@ -27,12 +27,18 @@ export function useIdle(
     videoRef.current?.play().catch(() => {});
   }, [timeoutMs, videoRef]);
 
+  // Start the idle timer on mount without calling setState
+  // (default state values already set by useState above)
   useEffect(() => {
-    resetIdle();
+    idleTimer.current = setTimeout(() => {
+      setShowOverlays(false);
+      onIdleRef.current?.();
+    }, timeoutMs);
     return () => {
       if (idleTimer.current) clearTimeout(idleTimer.current);
     };
-  }, [resetIdle]);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
 
   return { showOverlays, needsInteraction, setNeedsInteraction, resetIdle };
 }