feat: add AudioProvider for global audio state management

- Introduced `AudioProvider` with context for managing global mute state and active video.
- Added `useAudio` hook to access AudioContext conveniently.

frontend/src/providers/audio-provider.tsx

@@ -0,0 +1,45 @@
+"use client";
+
+import type React from "react";
+import { createContext, useCallback, useContext, useState } from "react";
+
+interface AudioContextType {
+	isGlobalMuted: boolean;
+	activeVideoId: string | null;
+	toggleGlobalMute: () => void;
+	setActiveVideo: (id: string | null) => void;
+}
+
+const AudioContext = createContext<AudioContextType | undefined>(undefined);
+
+export function AudioProvider({ children }: { children: React.ReactNode }) {
+	const [isGlobalMuted, setIsGlobalMuted] = useState(true);
+	const [activeVideoId, setActiveVideoId] = useState<string | null>(null);
+
+	const toggleGlobalMute = useCallback(() => {
+		setIsGlobalMuted((prev) => !prev);
+	}, []);
+
+	const setActiveVideo = useCallback((id: string | null) => {
+		setActiveVideoId(id);
+		if (id !== null) {
+			setIsGlobalMuted(false);
+		}
+	}, []);
+
+	return (
+		<AudioContext.Provider
+			value={{ isGlobalMuted, activeVideoId, toggleGlobalMute, setActiveVideo }}
+		>
+			{children}
+		</AudioContext.Provider>
+	);
+}
+
+export function useAudio() {
+	const context = useContext(AudioContext);
+	if (context === undefined) {
+		throw new Error("useAudio must be used within an AudioProvider");
+	}
+	return context;
+}