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/collection.js

@@ -0,0 +1,30 @@
+module.exports = {
+  'countBy': require('./countBy'),
+  'each': require('./each'),
+  'eachRight': require('./eachRight'),
+  'every': require('./every'),
+  'filter': require('./filter'),
+  'find': require('./find'),
+  'findLast': require('./findLast'),
+  'flatMap': require('./flatMap'),
+  'flatMapDeep': require('./flatMapDeep'),
+  'flatMapDepth': require('./flatMapDepth'),
+  'forEach': require('./forEach'),
+  'forEachRight': require('./forEachRight'),
+  'groupBy': require('./groupBy'),
+  'includes': require('./includes'),
+  'invokeMap': require('./invokeMap'),
+  'keyBy': require('./keyBy'),
+  'map': require('./map'),
+  'orderBy': require('./orderBy'),
+  'partition': require('./partition'),
+  'reduce': require('./reduce'),
+  'reduceRight': require('./reduceRight'),
+  'reject': require('./reject'),
+  'sample': require('./sample'),
+  'sampleSize': require('./sampleSize'),
+  'shuffle': require('./shuffle'),
+  'size': require('./size'),
+  'some': require('./some'),
+  'sortBy': require('./sortBy')
+};