The active tab is the only one that grows a gear and a close button, and with a
short session name they were eating it: "w1" rendered a 13px label while gear
plus close took 50px of a 116px tab, so the tab's geometric centre landed on the
gear and a thumb aiming at the middle of the tab opened Session Options instead
of switching sessions. Reserving a minimum label width on the active tab widens
the tab by the difference instead.
The floor is set by the 10th tab onward, which renders no number badge and so
sits 10px further right; a numbered tab clears the icons at 20px but a
numberless one needs 40px. The test recomputes that inequality from the
stylesheet rather than pinning the pixel.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
