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/app/(main)/dashboard/components/block-timeline.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useRef, useState, useEffect } from "react";
+import { useRef, useState, useEffect, useLayoutEffect } from "react";
 import type { ProgrammingBlock } from "@/lib/types";
 
 const SNAP_MINS = 15;
@@ -63,12 +63,13 @@ export function BlockTimeline({
   const containerRef = useRef<HTMLDivElement>(null);
   const dragRef = useRef<DragState | null>(null);
   const blocksRef = useRef(blocks);
-  blocksRef.current = blocks;
-
   const onChangeRef = useRef(onChange);
-  onChangeRef.current = onChange;
   const onCreateRef = useRef(onCreateBlock);
-  onCreateRef.current = onCreateBlock;
+  useLayoutEffect(() => {
+    blocksRef.current = blocks;
+    onChangeRef.current = onChange;
+    onCreateRef.current = onCreateBlock;
+  });
 
   const [draft, setDraft] = useState<Draft | null>(null);