## Summary
- Add `browser_tests/tests/bottomPanel.spec.ts` with tests for behaviors
not covered by existing `bottomPanelLogs` and `bottomPanelShortcuts`
specs
- Tests cover: close button (X), tab persistence on re-open, resize
gutter visibility and drag, canvas interaction when panel is closed,
cross-panel switching (terminal <-> shortcuts), and registered tab
enumeration
- Extend `BottomPanel` fixture with `closeButton` and `resizeGutter`
locators
## Test plan
- [ ] `pnpm test:browser:local` passes all new tests in
`bottomPanel.spec.ts`
- [ ] Existing `bottomPanelLogs.spec.ts` and
`bottomPanelShortcuts.spec.ts` are unaffected
- [ ] `pnpm typecheck:browser` passes
- [ ] `pnpm lint` passes
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-10814-test-add-E2E-tests-for-bottom-panel-core-behaviors-3366d73d365081ea9b90c643897845fa)
by [Unito](https://www.unito.io)
---------
Co-authored-by: dante <dante@danteui-MacStudio.local>
Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>
