Add service logs feature and improve tmux popup sizing

New Features:
- Add journalctl service logs viewer via Shift+J key
- Opens tmux popup with real-time log streaming using journalctl -f
- Shows last 50 lines and follows new log entries for selected service
- Popup titled 'Logs: service.service' for clear context

Improvements:
- Increase tmux popup size to 80% width and height for better readability
- Applies to both rebuild (R) and logs (J) popups
- Compact status line text to fit new J: Logs shortcut
- Updated documentation with new key binding

Navigation Updates:
- J: Show service logs (journalctl in tmux popup)
- Status line: Tab: Host • ↑↓/jk: Select • r: Rebuild • s/S: Start/Stop • J: Logs • q: Quit

Bump version to v0.1.46

CLAUDE.md

@@ -25,6 +25,7 @@ A high-performance Rust-based TUI dashboard for monitoring CMTEC infrastructure.
 - **Service Actions**: 
   - `s` - Start service (sends UserStart command)
   - `S` - Stop service (sends UserStop command)
+  - `J` - Show service logs (journalctl in tmux popup)
   - `R` - Rebuild current host
 - **Visual Status**: Green ● (active), Yellow ◐ (inactive), Red ◯ (failed)
 - **Transitional Icons**: Blue arrows during operations
@@ -32,6 +33,7 @@ A high-performance Rust-based TUI dashboard for monitoring CMTEC infrastructure.
 ### Navigation
 - **Tab**: Switch between hosts
 - **↑↓ or j/k**: Select services
+- **J**: Show service logs (journalctl)
 - **q**: Quit dashboard
 
 ## Core Architecture Principles