- index.html: tighten the viewport meta with maximum-scale=1,
user-scalable=no, viewport-fit=cover so pinch-zoom is disabled
on browsers that honor the hint (Android Chrome).
- SearchPanel: bump the mobile search input from text-sm (14px) to
text-base (16px). iOS Safari auto-zooms inputs whose font-size is
below 16px on focus, which widened the viewport and let the user
pan horizontally; 16px stops that behavior at the source.
