Add responsive layout for mobile
- Sidebar becomes a fixed drawer on ≀768px: slides in from left with
  transform + transition, backdrop overlay behind it
- Hamburger ☰ button in chat header (hidden on desktop, visible on mobile)
- Backdrop click closes sidebar; session select also closes it
- Wider message bubbles (90%) and tighter padding on small screens
- No layout changes on desktop

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
1 parent 42c6012 commit 7fdab7a0965bbd9804c53fb99b2818054651eb53
@Eugene Sukhodolskiy Eugene Sukhodolskiy authored on 10 Apr
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client/index.html
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client/style.css