Client-side xterm.js was generating Device Attributes responses via
onData, which fed back to the PTY as visible text. Register CSI handlers
to consume query responses on the client and respond to DA1 on the server.
- Add drag-and-drop tab reordering with persistent tab order
- Add right-click context menu with copy agent ID, copy resume command, close to right
- Switch workspace route encoding from percent-encoding to base64url
- Remove terminal auto-creation on directory listing (explicit create only)
- Add swipe gestures on terminal emulator for mobile sidebar navigation
- Highlight active workspace row in sidebar
