refactor: extract inline css/js from index.html

index.html shrank from 1650 to 349 lines. Inline <style>
moved to index.css, ARTICLES data to articles.js, the rest of
the inline script to index.js. Also:

- drop unused bindMusicToggle from aero.js
- collapse duplicate click+dblclick icon handlers
- dedup music-toggle gradient via .mt-btn.on class
- replace inline styles in films/podcast/now-playing renderers
  with semantic classes (.film-when, .pod-ep, .np-row, etc.)
- precompute article readMin and plainTitle once instead of on
  every render

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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