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.
Refactored PricingTiers component to better handle empty, null, and undefined values, prevent formatting issues, and add error handling for tier changes. Updated ProductModal to use parseFloat for price values to improve precision. Minor robustness improvements to event handling and sorting.
