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/edit-channel-sheet.tsx

@@ -9,7 +9,7 @@ import {
   SheetTitle,
 } from "@/components/ui/sheet";
 import { Button } from "@/components/ui/button";
-import { BlockTimeline, BLOCK_COLORS, minsToTime } from "./block-timeline";
+import { BlockTimeline, BLOCK_COLORS } from "./block-timeline";
 import { AlgorithmicFilterEditor } from "./algorithmic-filter-editor";
 import { RecyclePolicyEditor } from "./recycle-policy-editor";
 import { WebhookEditor } from "./webhook-editor";
@@ -23,7 +23,6 @@ import type {
   ChannelResponse,
   LogoPosition,
   ProgrammingBlock,
-  BlockContent,
   FillStrategy,
   MediaFilter,
   ProviderInfo,