feat: AI-CLI workflow optimizations

- 200K scrollback, vi-mode copy, copy-on-select
- Ctrl-A S captures pane to ~/logs/, Ctrl-A L toggles live logging
- Status bar shows git branch + working directory
- Pre-built session: code/git/run/logs windows
- Aggressive resize + focus events for multi-device switching
- Toolbar: added Paste (clipboard), Zoom (pane fullscreen), Save (capture)
- All new windows inherit current working directory
- Toolbar split into 2 rows for more buttons without clutter

systemd/sethmux.service

@@ -7,7 +7,7 @@ Type=simple
 User=rdp
 Group=rdp
 
-ExecStartPre=/bin/bash -c "/usr/bin/tmux kill-session -t sethmux 2>/dev/null; sleep 0.5; /usr/bin/tmux new-session -d -s sethmux -x 120 -y 40"
+ExecStartPre=/opt/sethmux/sethmux-start.sh
 ExecStart=/usr/local/bin/ttyd \
     --port 7683 \
     --interface 0.0.0.0 \