Add global polyfills for AbortSignal.timeout() (Safari <17, Firefox <122)
and crypto.randomUUID() (Safari <15.4, Firefox <95) in shell HTML templates.
Add -webkit-backdrop-filter prefix across 13 files for older Safari support.
Add Firefox scrollbar (scrollbar-width/scrollbar-color), range input
(::-moz-range-thumb/track), and color-mix() rgba fallbacks. Create shared
compat.ts utility module. Lowers browser floor from Safari 17/Firefox 122
to Safari 15.4/Firefox 95.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Extract meeting point, share, import, and privacy modals from
folk-map-viewer.ts (2504→2147 lines) into standalone web components
that communicate via CustomEvent dispatch. Add OSM tile caching
(cache-first, LRU at 500), IndexedDB room state persistence for
offline location pinging, and auto-persist room state on every sync
update so last-known positions survive tab close.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Jeff Emmett