The rightmost tab in the right-pane strip becomes unclickable as the pane narrows

### Description ### What happens As the right pane is made narrower, the rightmost tab in the strip progressively stops responding to clicks: first its right portion goes dead, and once the pane is narrow enough, the **whole tab** is unclickable. Widening the pane restores it. I noticed after adding a custom widgets as that becomes the rightmost one and the visible victim. Without any custom widget, the rightmost built-in tab shows the identical behaviour. Narrow the pane further to see it, because fewer tabs take less room. So more tabs → triggers at a wider pane; fewer tabs → only when narrower. ### Expected The rightmost tab stays fully clickable at any pane width (the whole `button.tab-strip-tab` segment), like the others. ### Steps to reproduce 1. Open a note with the right sidebar shown. 2. Narrow the pane gradually and click the rightmost tab: at some width its right portion stops selecting, and narrower still the whole tab stops responding. 3. Widen the pane and it becomes fully clickable again. 4. (Optional) Add or remove a tab, e.g., by installing/removing a custom right-pane widget: the affected tab is always whichever is currently rightmost, and the threshold width shifts with the number of tabs. ### Notes / pointers - **Width-dependent and position-dependent:**: the dead area grows from the tab's right edge inward as the pane shrinks. Points to the last tab being progressively overlapped/clipped by a neighbour, not to anything about the button itself. ### TriliumNext Version 0.105 ### What operating system are you using? Ubuntu ### What is your setup? Local + server sync ### Operating System Version 24.04 ### Error logs _No response_