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/context/auth-context.tsx

@@ -4,7 +4,6 @@ import {
   createContext,
   useContext,
   useState,
-  useEffect,
   type ReactNode,
 } from "react";
 
@@ -20,14 +19,15 @@ interface AuthContextValue {
 const AuthContext = createContext<AuthContextValue | null>(null);
 
 export function AuthProvider({ children }: { children: ReactNode }) {
-  const [token, setTokenState] = useState<string | null>(null);
-  const [isLoaded, setIsLoaded] = useState(false);
-
-  useEffect(() => {
-    const stored = localStorage.getItem(TOKEN_KEY);
-    if (stored) setTokenState(stored);
-    setIsLoaded(true);
-  }, []);
+  const [token, setTokenState] = useState<string | null>(() => {
+    try {
+      return localStorage.getItem(TOKEN_KEY);
+    } catch {
+      return null;
+    }
+  });
+  // isLoaded is always true: lazy init above reads localStorage synchronously
+  const [isLoaded] = useState(true);
 
   const setToken = (t: string | null) => {
     setTokenState(t);