feat(plan): add "Yes, restore previous mode" option when exiting plan mode (#3008)

* feat(plan): add "Yes, restore previous mode" option when exiting plan mode

When exiting plan mode, users previously had no way to restore their
original approval mode (e.g. YOLO). Add a new default option that
restores the pre-plan approval mode, with a dynamic label showing
which mode will be restored.

Closes #3002

* test: add fallback test for RestorePrevious when no prePlanMode recorded

* fix: handle RestorePrevious in telemetry and ACP mode notification

- Add RestorePrevious to telemetry decision mapping as ACCEPT
- Fix sendCurrentModeUpdateNotification to read actual mode for
  RestorePrevious instead of defaulting to 'default'

* test: add plan confirmation tests for RestorePrevious in permissionUtils

packages/cli/src/ui/components/messages/ToolConfirmationMessage.tsx

@@ -302,6 +302,13 @@ export const ToolConfirmationMessage: React.FC<
     const planProps = confirmationDetails;
 
     question = planProps.title;
+    options.push({
+      key: 'restore-previous',
+      label: t('Yes, restore previous mode ({{mode}})', {
+        mode: planProps.prePlanMode ?? 'default',
+      }),
+      value: ToolConfirmationOutcome.RestorePrevious,
+    });
     options.push({
       key: 'proceed-always',
       label: t('Yes, and auto-accept edits'),