feat(nav): add j/k vim-style navigation to all TUI menus

[dudeinthemirror]

Summary

Adds vim-style j/k keybindings (down/up) to every interactive prompt_toolkit panel, sitting alongside the existing arrow keys and Ctrl+P/Ctrl+N bindings.

Panels updated

File	Notes
command_line/agent_menu.py	j/k added, hint text updated
command_line/autosave_menu.py	works in both normal and browse mode
command_line/colors_menu.py	split-panel selector updated
command_line/judges_menu.py	main list + model-list section (filtered so j/k type normally in TextArea)
command_line/mcp_binding_menu.py	agent-binding panel + post-install bind panel
command_line/model_settings_menu.py	both models and settings view levels
command_line/set_menu.py	smart mode: navigates when idle, types into search buffer when / search is active
command_line/uc_menu.py	both list_kb and source_kb bindings
tools/common.py	arrow_select_async + arrow_select (sync)

Bug fix included

Fixed a syntax error in arrow_select() (sync) where the try: asyncio.get_running_loop() block was accidentally replaced with an invalid with suspended_key_listener(): await app.run_async() — mixing async into a sync function and leaving a dangling except with no try.

Testing

All 2190 tests pass across tests/command_line/ and tests/tools/test_common*.py.

[mpfaffenberger]

Hey @dudeinthemirror some of the menus are listening for search strings when you type. How would j/k interaction work with those?

[dudeinthemirror]

Hey @dudeinthemirror some of the menus are listening for search strings when you type. How would j/k interaction work with those?

yeah, I excluded those ones (like /model or / (to display a dropdown of commands))