feat: add web version of music player with expressive UI

[Ivorisnoob]

• Created WEB directory for vanilla HTML/CSS/JS frontend
• Implemented neo-brutalist, playful design using bold colors and strong typography
• Added a floating toy-like player dock and vinyl record animations
• Implemented basic audio player logic with mock tracks
• Verified frontend changes with Playwright screenshots

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PR created automatically by Jules for task 8858576095268134703 started by @Ivorisnoob

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