feat(palette): add Up/Down arrow navigation and Enter key selection

- Process arrow keys BEFORE input_text so the input field does not consume them
- Up/Down arrow keys navigate the result list (clamped to bounds)
- Enter and KeypadEnter execute the currently selected command
- Refactored _close_palette and _execute helpers (action call is now wrapped in try/except via _execute)
- Added 3 new tests: close helper resets state, execute runs and catches exceptions, top_n is meaningful for navigation

tests/test_command_palette_sim.py

@@ -98,3 +98,66 @@ def test_palette_query_state_resets_on_open(live_gui: Any) -> None:
  # The internal _command_palette_query is set to "" on open.
  # We can't directly query it via the hook, but the state being
  # queryable via show_command_palette confirms the toggle worked.
+
+
+def test_palette_close_helper_resets_all_state() -> None:
+ """_close_palette resets all per-open state flags. Pure unit test."""
+ from src.command_palette import _close_palette
+ from unittest.mock import MagicMock
+
+ mock_app = MagicMock()
+ mock_app.show_command_palette = True
+ mock_app._command_palette_query = "save"
+ mock_app._command_palette_selected = 2
+ mock_app._command_palette_focused = True
+ mock_app._command_palette_input_focused = True
+
+ _close_palette(mock_app)
+
+ assert mock_app.show_command_palette is False
+ assert mock_app._command_palette_query == ""
+ assert mock_app._command_palette_selected == 0
+ assert mock_app._command_palette_focused is False
+ assert mock_app._command_palette_input_focused is False
+
+
+def test_execute_runs_command_and_closes() -> None:
+ """_execute runs a command and closes the palette, catching exceptions. Pure unit test."""
+ from src.command_palette import _execute, Command
+ from unittest.mock import MagicMock
+
+ # Build a mock app and a "good" command
+ mock_app = MagicMock()
+ mock_app.show_command_palette = True
+ good_command = Command(
+  id="test_good",
+  title="Test Good",
+  category="test",
+  action=lambda app: setattr(app, "ran", True),
+ )
+ _execute(mock_app, good_command)
+ assert mock_app.ran is True
+ assert mock_app.show_command_palette is False
+
+ # Build a "bad" command that raises
+ bad_app = MagicMock()
+ bad_app.show_command_palette = True
+ bad_command = Command(
+  id="test_bad",
+  title="Test Bad",
+  category="test",
+  action=lambda app: (_ for _ in ()).throw(RuntimeError("boom")),
+ )
+ # Should NOT raise
+ _execute(bad_app, bad_command)
+ # Palette should still close
+ assert bad_app.show_command_palette is False
+
+
+def test_fuzzy_match_returns_top_n_for_navigation() -> None:
+ """The palette returns up to top_n results so Up/Down navigation is meaningful."""
+ from src.commands import registry
+ all_commands = registry.all()
+ # We have 11 commands; fuzzy_match with empty query returns all
+ # Verify there are enough commands to navigate through with Up/Down
+ assert len(all_commands) >= 3, "Need at least 3 commands to test navigation"