app: responsive terminal layout

Sidebar uses auto width (min 16, max 32) instead of fixed 24. Channel and user names truncate with ellipsis at widget boundary. Status bar adapts format based on available width. Resize events trigger re-render of width-aware widgets.
2026-02-24 12:31:55 +01:00
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 ## Phase 3 — Polish

+- [x] Responsive terminal layout (adaptive sidebar, truncation, resize)
 - [ ] Channel tree navigation
 - [ ] User list with status indicators
 - [ ] Volume control