feat: desktop-style UI rewrite — dark theme, relay manager, identicons
Complete InCallScreen rewrite matching desktop layout:
Connect screen:
- Dark theme (matching desktop CSS vars)
- Relay button with lock icon + RTT, opens Manage Relays dialog
- Room/Alias text fields, AEC checkbox, settings gear
- Full-width red Connect button
- Identity with identicon + fingerprint
- Recent rooms grouped and colored by server
Manage Relays dialog:
- Server list with identicons, lock icons, RTT, delete
- Selected server highlighted with accent border
- Add relay inputs + button
In-call screen:
- Room name + gear, green dot + timer
- Gradient audio level meter
- Participant card with identicons + fingerprints
- Mic / End / Spk controls
- TX/RX stats
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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