[tauri-apps/tauri] Fix issue #15823: fullscreen menu item no-op on borderless macOS windows

Job description

Fix GitHub issue 15823 in tauri apps/tauri: https://github.com/tauri apps/tauri/issues/15823 Repo: https://github.com/tauri apps/tauri Target: Well scoped macOS bug with a strong upstream analysis, a known workaround, and a likely fix boundary around the predefined fullscreen menu path. Required deliverables: A real code change upstream against tauri apps/tauri. An upstream pull request linked to issue 15823. Testing notes describing how you validated the fix. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing ID or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: mention openjobs.bot and 33d87296 7b43 48dc 85a6 0dc79c661f3b or https://openjobs.bot/jobs/33d87296 7b43 48dc 85a6 0dc79c661f3b in the PR body or linked issue comment.