Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/ui/Tabs/TabbedLinks.tsx`:
- Around line 157-159: The active-tab check in TabbedLinks is treating missing
keys as a match because activeTabName and TabLink.key are both optional, so
guard the activeTabName === key comparison against undefined before using it in
isOverflowActive and the other tab selection checks. Update the matching logic
in TabbedLinks to only compare keys when both values are present, while still
allowing pathname-based matching for tabs without keys, including the overflow
trigger and overflow items.
- Around line 87-96: Allow zero visible tabs in TabbedLinks when only the
overflow trigger fits, instead of forcing at least one tab visible. Update the
visible-count calculation in the loop that uses widths, available, and
triggerWidthRef.current so setVisibleCount can receive 0 when the first tab plus
the trigger exceeds the container, ensuring the “More” trigger remains reachable
under overflow-hidden.
- Around line 196-199: The overflow trigger in TabbedLinks should retain a
visible keyboard focus indicator instead of suppressing it with
focus:outline-none. Update the className composition for the “More” control in
TabbedLinks so it still has a clear focus style when tabbed to, using the
existing tabClassName/overflowMenu path as the place to add or restore the focus
state.