Add progressive web app companion for cross-platform access

Vite + TypeScript PWA that mirrors the Android app's core features:
- Pre-processed shelter data (build-time UTM33N→WGS84 conversion)
- Leaflet map with shelter markers, user location, and offline tiles
- Canvas compass arrow (ported from DirectionArrowView.kt)
- IndexedDB shelter cache with 7-day staleness check
- Service worker with CacheFirst tiles and precached app shell
- i18n for en, nb, nn (ported from Android strings.xml)
- iOS/Android compass handling with low-pass filter
- Respects user map interaction (no auto-snap on pan/zoom)
- Build revision cache-breaker for reliable SW updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pwa/node_modules/lodash/function.js

@@ -0,0 +1,25 @@
+module.exports = {
+  'after': require('./after'),
+  'ary': require('./ary'),
+  'before': require('./before'),
+  'bind': require('./bind'),
+  'bindKey': require('./bindKey'),
+  'curry': require('./curry'),
+  'curryRight': require('./curryRight'),
+  'debounce': require('./debounce'),
+  'defer': require('./defer'),
+  'delay': require('./delay'),
+  'flip': require('./flip'),
+  'memoize': require('./memoize'),
+  'negate': require('./negate'),
+  'once': require('./once'),
+  'overArgs': require('./overArgs'),
+  'partial': require('./partial'),
+  'partialRight': require('./partialRight'),
+  'rearg': require('./rearg'),
+  'rest': require('./rest'),
+  'spread': require('./spread'),
+  'throttle': require('./throttle'),
+  'unary': require('./unary'),
+  'wrap': require('./wrap')
+};