[FIX] topbar: close font size editor dropdown and focus grid #7558
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Description:
Pressing Tab in the font size editor moves focus to the hidden “add more rows” footer (the next focusable element in the DOM). This caused the browser to auto-scroll to the footer while the grid viewport state remained unchanged, making the footer appear to float over the grid.
Now, when the font size editor loses focus (via blur/Tab), it closes its dropdown and redirects focus back to the grid instead of the footer.
Task: 5263792
review checklist
Forward-Port-Of: #7495