Implemented user blocking functionality:
- /block <nickname> - blocks a user from private messaging and ignores their messages in channels
- /block - lists all blocked users
- /unblock <nickname> - unblocks a user
Implementation details:
- Blocks are stored by public key fingerprint for persistence across sessions
- Blocked users cannot send private messages or have their public messages displayed
- Blocked users are silently ignored (they don't know they're blocked)
- Blocking a user automatically removes them from favorites
- Added getPeerPublicKey() method to BluetoothMeshService for accessing peer identity keys
Fixed multiple threading issues that were causing crashes when users sent messages:
- Added NSLock to synchronize access to recentlySentMessages Set
- Fixed thread-unsafe access to activePeers Set using existing lock
- Removed force unwrapping that could cause crashes
- Added defensive input validation for message sending methods
These fixes address crashes reported in TestFlight where the app would crash when typing and sending messages.
- Changed system messages from green to grey with consistent 12pt font
- Fixed text wrapping to flow naturally under timestamps
- Changed default nickname to anonXXXX format
- Replaced text with icon representations in status bar
- Added icons to sidebar section headers
- Made autocomplete UI consistent between commands and @mentions
- Added welcome message for new users (3 second delay)
- Changed sidebar header to 'YOUR NETWORK'
- Added command aliases (/join, /msg)
- Implemented /hug and /slap commands with haptic feedback
- Improved command help display with alphabetization
- Renamed 'rooms' to 'channels' throughout entire codebase
- Fix race condition where recentlySentMessages Set was being modified from different queues
- Move all Set.remove operations to messageQueue instead of main queue
- Prevents EXC_BREAKPOINT crash when removing elements during concurrent access
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