#1253 Search box collapses to near-zero width on mobile on the Extensions page

Description

On the Extensions page (swamp-club.com), the search box in the SELECTION bar collapses on mobile. The adjacent buttons (the sort/order icons and the RESULTS count) take up the row and squish the search input down to less than one character wide, making it unusable — you can't see or type into it.

Steps to reproduce

1. On a mobile device (or narrow viewport), open the Extensions page.
2. Look at the SELECTION bar (search input + sort icons + RESULTS count).
3. Observe: the search input is squeezed to near-zero width by the buttons beside it.

Expected behavior

On mobile, the search input should keep a usable width — the buttons should wrap to another line, shrink, or otherwise not crowd the input out — so it's at least wide enough to see and type into.

Actual behavior

The buttons squish the search box down to less than one character wide; it's effectively unusable.

Environment

• Extensions page, mobile viewport (observed on iPhone-width screen).