- Added voice note support to BitchatMessage with audio data and duration
- Updated binary protocol to encode/decode voice notes (flag 0x40)
- Created AudioRecordingService for recording up to 10s voice clips
- Created AudioPlaybackService for playing voice notes
- Added microphone permission to Info.plist and project.yml
- Implemented push-to-talk UI with mic button in ContentView
- Voice notes use AAC compression at 16kHz/32kbps for small file sizes
- Added play/pause buttons for voice notes in message list
- Voice notes display as '🎤 Voice note (X.Xs)' in chat
- Platform-specific audio session handling for iOS/macOS
- Added autocomplete state tracking in ChatViewModel
- Implemented updateAutocomplete() to parse @ mentions and show suggestions
- Added completeNickname() to handle nickname completion
- Created autocomplete UI overlay above input field
- Shows list of matching nicknames when typing @
- Highlights selected suggestion
- Clicking suggestion completes the mention
- Implemented compact binary encoding for packets and messages
- Reduced packet size significantly (13-byte fixed header + variable payload)
- Optimized for BLE's limited MTU with smaller message sizes
- Added BinaryProtocol.swift with encode/decode functions
- Updated all message types to use binary serialization
- Maintains all existing functionality with better performance
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