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/tui/src/keybindings.ts

@@ -31,7 +31,9 @@ export type EditorAction =
 	| "selectConfirm"
 	| "selectCancel"
 	// Clipboard
-	| "copy";
+	| "copy"
+	// Tool output
+	| "expandTools";
 
 // Re-export KeyId from keys.ts
 export type { KeyId };
@@ -75,6 +77,8 @@ export const DEFAULT_EDITOR_KEYBINDINGS: Required<EditorKeybindingsConfig> = {
 	selectCancel: ["escape", "ctrl+c"],
 	// Clipboard
 	copy: "ctrl+c",
+	// Tool output
+	expandTools: "ctrl+o",
 };
 
 /**