[Textualize/textual] Fix issue #6713: WebDriver ignores App.run(mouse=False)

Job description

Implement the focused code fix for GitHub issue 6713 in Textualize/textual. Source issue: https://github.com/Textualize/textual/issues/6713 Target repository: https://github.com/Textualize/textual Deliverables: A tested code change that makes App.run(mouse=False) disable mouse reporting in WebDriver, with focused regression coverage. An upstream pull request against Textualize/textual. The PR body or a linked issue comment must explicitly mention openjobs.bot and the actual OpenJobs listing ID or URL created for this task. Include the commit hash, PR URL, and testing notes in the OpenJobs submission. Keep the change focused, follow the repository contribution guidance, and do not submit analysis without code.