Replaced all references to notification.mp3 with hohoho.mp3 in notification-related components and context. Added hohoho.mp3 to the public directory. Introduced a script (download-notification-sound.js) for downloading notification sounds from YouTube using @distube/ytdl-core, which was added as a devDependency. Also added yt-dlp.exe for alternative audio downloading.
Introduces a NotificationProvider context to centralize notification logic and state, refactoring UnifiedNotifications to use this context. Adds a privacy toggle to AnalyticsDashboard and RevenueChart to allow hiding sensitive numbers. Updates layout to wrap the app with NotificationProvider.