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

src/command_palette.py

@@ -103,6 +103,26 @@ def _count_gaps(query: str, target: str) -> int:
  return gaps
 
 
+def _close_palette(app: Any) -> None:
+ """Close the palette and reset all per-open state."""
+ app.show_command_palette = False
+ app._command_palette_query = ""
+ app._command_palette_selected = 0
+ app._command_palette_focused = False
+ app._command_palette_input_focused = False
+
+
+def _execute(app: Any, command: Command) -> None:
+ """Run a command and close the palette. Catches exceptions to keep the modal clean."""
+ if not command.action:
+  return
+ try:
+  command.action(app)
+ except Exception as e:
+  print(f"[CommandPalette] Action {command.id} raised: {e}")
+ _close_palette(app)
+
+
 def render_palette_modal(app: Any, commands: List[Command]) -> None:
  if not getattr(app, "show_command_palette", False):
   return
@@ -128,8 +148,7 @@ def render_palette_modal(app: Any, commands: List[Command]) -> None:
 
  # Escape closes the palette.
  if imgui.is_key_pressed(imgui.Key.escape):
-  app.show_command_palette = False
-  app._command_palette_focused = False
+  _close_palette(app)
   return
 
  expanded, opened = imgui.begin("Command Palette##manual_slop", True, imgui.WindowFlags_.no_collapse)
@@ -144,11 +163,27 @@ def render_palette_modal(app: Any, commands: List[Command]) -> None:
   imgui.set_keyboard_focus_here()
   app._command_palette_input_focused = True
 
+ # Process Up/Down/Enter BEFORE input_text so we see the keys before the
+ # input field consumes them for cursor movement / text editing.
+ results = fuzzy_match(app._command_palette_query, commands, top_n=20)
+ if results:
+  app._command_palette_selected = max(0, min(app._command_palette_selected, len(results) - 1))
+ else:
+  app._command_palette_selected = 0
+
+ if imgui.is_key_pressed(imgui.Key.down_arrow):
+  if results:
+   app._command_palette_selected = min(app._command_palette_selected + 1, len(results) - 1)
+ if imgui.is_key_pressed(imgui.Key.up_arrow):
+  if results:
+   app._command_palette_selected = max(app._command_palette_selected - 1, 0)
+ if imgui.is_key_pressed(imgui.Key.enter) or imgui.is_key_pressed(imgui.Key.keypad_enter):
+  if results and 0 <= app._command_palette_selected < len(results):
+   _execute(app, results[app._command_palette_selected].command)
+
  imgui.set_next_item_width(-1)
  _, app._command_palette_query = imgui.input_text("##query", app._command_palette_query)
 
- results = fuzzy_match(app._command_palette_query, commands, top_n=20)
-
  if imgui.begin_child("##results", (0, -1)):
   for i, scored in enumerate(results):
    is_selected = (i == app._command_palette_selected)
@@ -156,17 +191,7 @@ def render_palette_modal(app: Any, commands: List[Command]) -> None:
    clicked, _ = imgui.selectable(label, is_selected)
    if clicked:
     app._command_palette_selected = i
-    if scored.command.action:
-     try:
-      scored.command.action(app)
-     except Exception as e:
-      # Don't let a buggy action break the end_child/end pairing.
-      print(f"[CommandPalette] Action {scored.command.id} raised: {e}")
-    app.show_command_palette = False
-    app._command_palette_query = ""
-    app._command_palette_selected = 0
-    app._command_palette_focused = False
-    app._command_palette_input_focused = False
+    _execute(app, scored.command)
   if not results:
    imgui.text_disabled("No matching commands.")
  imgui.end_child()