Backport from desktop client to Android:
Identicons:
- New Identicon.kt composable: deterministic 5x5 symmetric Canvas pattern
from fingerprint hash (same algorithm as desktop identicon.ts)
- Participant list shows identicon + name + tappable fingerprint
- Settings page shows identicon next to fingerprint
CopyableFingerprint:
- Tap any fingerprint text to copy to clipboard with Toast feedback
- Used in participant list and settings page
Recent rooms:
- SettingsRepository: persists last 5 (relay, room) pairs
- CallViewModel: saves on startCall, exposes as StateFlow
- InCallScreen: clickable chips that fill room + select matching server
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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