Mobile-audit batch 3. All changes mobile-gated (@media <=750px) so desktop is
unchanged.
- ModalWide: fill the phone screen (100vw/100vh, no radius) at <=750px instead
of floating as an 85vw card. This also full-screens the file/PDF viewer and
the avatar-crop editor on mobile (they share ModalWide) — intended.
- UserHero avatar viewer: new mobile-only ModalMobileFull class (no desktop
effect) so it goes edge-to-edge on phones like the timeline lightbox.
- usePan: add touch support (single-finger drag, cleaned up on
touchend/cancel/unmount) alongside the unchanged mouse path, so a zoomed image
can be panned on a phone. Wired into ImageViewer and the MediaGallery lightbox.
Two review passes: mouse path byte-for-byte unchanged; desktop provably
unaffected; touch is gated to zoom!=1 so a non-zoomed image never hijacks
swipe/scroll.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>