## Summary
- Add E2E tests for the `ActionBarButtons` toolbar component (FE-111)
- Add `data-testid="action-bar-buttons"` to the container div for stable
test targeting
- Register `TestIds.topbar.actionBarButtons` in `selectors.ts`
## Changes
- `browser_tests/tests/actionBarButtons.spec.ts` — 6 tests across 5
scenarios: empty state, button rendering, icon rendering, multiple
buttons, click handler, mobile label hiding
- `src/components/topbar/ActionBarButtons.vue` — adds `data-testid` to
container
- `browser_tests/fixtures/selectors.ts` — registers new test ID
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **Low Risk**
> Primarily adds Playwright coverage and a `data-testid` attribute;
runtime behavior is unchanged aside from an extra DOM attribute.
>
> **Overview**
> Adds a new Playwright spec (`actionBarButtons.spec.ts`) that verifies
the ActionBarButtons container empty state, rendering (label/icon),
multiple buttons, click handler execution, and mobile label-hiding
behavior by registering buttons via `window.app!.registerExtension`.
>
> Updates the UI and test selector plumbing by adding
`data-testid="action-bar-buttons"` to `ActionBarButtons.vue` and
exposing it as `TestIds.topbar.actionBarButtons` for stable E2E
targeting.
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
80f90d1f1d. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-11561-test-add-E2E-tests-for-ActionBarButtons-toolbar-component-34b6d73d36508153874fda856a78817f)
by [Unito](https://www.unito.io)
e7640d414b