fix: use configurable expandTools keybinding instead of hardcoded ctrl+o (#717)

- Add expandTools to EditorAction in pi-tui so components can access it
- Update bash-execution, compaction-summary-message, branch-summary-message,
  and tool-execution to use getEditorKeybindings().getKeys('expandTools')
- Pass expandTools config to setEditorKeybindings in KeybindingsManager.create()
- Style keybinding with 'dim' color, description with 'muted' (matches startup hints)

packages/coding-agent/src/core/keybindings.ts

@@ -111,9 +111,10 @@ export class KeybindingsManager {
 		const manager = new KeybindingsManager(config);
 
 		// Set up editor keybindings globally
+		// Include both editor actions and expandTools (shared between app and editor)
 		const editorConfig: EditorKeybindingsConfig = {};
 		for (const [action, keys] of Object.entries(config)) {
-			if (!isAppAction(action)) {
+			if (!isAppAction(action) || action === "expandTools") {
 				editorConfig[action as EditorAction] = keys;
 			}
 		}