Implements a thread viewer that displays Nostr conversations with:
- Automatic root resolution for NIP-10 (kind 1) and NIP-22 (kind 1111)
- 2-level tree structure with expand/collapse
- Thread participants display with usernames
- Read-only relay dropdown showing connection status
- Chronological sorting of replies
- Context menu integration on all events
Components:
- ThreadViewer: Main thread display with header and root event
- ThreadConversation: 2-level threaded reply tree
- thread-parser: Command argument parsing
UI Integration:
- Added "Thread" action to event dropdown menu
- Added right-click context menu to all events
- Wired into window rendering system
- Added to man pages with examples
Usage: thread <note1|nevent1|naddr1|hex-id>
