fix(ui): ribbon others tab flickering resolved

[rahulnayanegali]

close #3744

This PR addresses the flickering issue in the Ribbon component's 'Others' tab. The problem was caused by unnecessary re-renders triggered by the ResizeObserver. The fix implements useMemo for the fake toolbar content to prevent unnecessary re-creation and optimizes the ResizeObserver usage to reduce unnecessary updates.

To test:

• Open http://localhost:3002/sheets/.
• Observe the 'Others' tab in the Ribbon, especially when resizing the window.
• Verify that the tab remains stable without constant flickering.

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

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[jikkai]

LGTM