FUSE: Integrate MountManager with App

[efimsky]

Parent Issue

Part of #118 (FUSE-based Archive & Remote Browsing Feature)

Summary

Integrate MountManager into the main App class to enable archive browsing on Enter key.

Dependencies

Requires #120 (Archive mounting operations)

Tasks

App Initialization

• Add self.mount_manager: MountManager | None = None to App.__init__()
• Initialize MountManager in App.setup() after color init

  from tnc.mount import MountManager
  self.mount_manager = MountManager()

Enter Key Handler

• Modify Enter key handler in handle_key() (around line 437-443)
• After self.active_panel.enter() returns a file path:
  • Check if path is an archive using mount_manager.is_archive()
  • If archive, call _enter_archive(path) instead of doing nothing
• Implement App._enter_archive(path) method:
  • Call mount_manager.mount_archive(path)
  • If successful, navigate panel to mount point
  • If failed, show error message

Cleanup

• Modify App.cleanup() to call mount_manager.unmount_all()

  def cleanup(self) -> None:
      if self.mount_manager:
          self.mount_manager.unmount_all()
      # ... existing cleanup

Panel Header Indicator

• Modify Panel.get_header_text() to add [M] prefix when inside mount
• Check if path starts with /tmp/tnc-mounts/

  if str(self.path).startswith('/tmp/tnc-mounts/'):
      header = "[M] " + header

Testing

• Test App has mount_manager attribute after setup
• Test App.mount_manager is a MountManager instance
• Test cleanup() calls mount_manager.unmount_all()
• Test Enter on archive mounts and navigates into it
• Test Enter on archive shows error when mount fails
• Test Enter on archive without tool shows appropriate error
• Test panel header shows [M] when inside mount
• Test panel header does NOT show [M] for normal directories

Files

• Modify: tnc/app.py
• Modify: tnc/panel.py
• Create: tests/test_archive_browsing.py