What changed

• Capture tab ids before send_keys and reuse the existing new-tab detection after the key event finishes.
• This gives send_keys(keys="Enter") the same new-tab feedback/auto-switch behavior that click actions already have.
• Add a regression test for an Enter key action that opens a new tab.

Fixes #4758 for the Enter-key path. The click path already uses this helper on current main.

Testing

• uv run --with pytest --with pytest-asyncio python -m pytest tests/ci/test_send_keys_new_tab_detection.py -q
• uv run --with ruff ruff check browser_use/tools/service.py tests/ci/test_send_keys_new_tab_detection.py
• uv run --with ruff ruff format --check browser_use/tools/service.py tests/ci/test_send_keys_new_tab_detection.py

Summary by cubic

Report and auto-switch to new tabs opened by send_keys (e.g., Enter) to match click behavior. We capture tabs before the key event and reuse the existing new-tab detection.

• Bug Fixes
  • send_keys now reports and switches to a new tab when Enter opens one, consistent with click actions.
  • Added a regression test for the Enter-key path.

^{Written for commit 9a4cbf2. Summary will update on new commits. Review in cubic}