feat(chat): add 1:1 and family group chat module for legacy dashboard
- Module structure mirrors location pattern (core/data, core/domain, core/providers, features)
- Supports text, emoji, image and audio messages over POST /chat-messages multipart
- Optimistic UI with status reconciliation via 4s polling and circuit breaker after 3 errors
- Offline queue persisted in SharedPreferences, drained on conversation re-open
- WhatsApp-style audio recorder with long-press, slide-to-cancel, haptics and animated overlay
- Image picker (camera/gallery) with on-device 1024px JPEG compression
- Single-audio playback coordinator across bubbles
- Family group fan-out: N parallel POSTs sharing chatId, members derived from delegationId
- Reuses LegacyOptionCard extracted from videocall idle screen
- Tracking events legacy_chat_opened, message_sent, image_sent, audio_sent, permission_denied (no PII)
- WebSocket ChatMessageEvent parser added for future backend support
- Push command CHAT_MESSAGE handled in notifications_init for deep-linking
- 15 unit tests covering id resolver, file url builder and repository
Pending backend coordination: GET /chat-messages 500 (parseQueryParams), push routing heuristic, file size/mime limits.
JulianAlcala
54b81818ec