The top-center floating HUDs (command palette + session switcher) pin at
top-3, overlapping the titlebar's `[-webkit-app-region:drag]` bands. Drag
regions win hit-testing over the DOM regardless of z-index, so the top of
each surface — the search input — swallowed clicks, leaving only a ~2px
strip focusable. Add `[-webkit-app-region:no-drag]` to the shared
HUD_SURFACE so the whole surface is interactive.
03311abe49