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/chain.js

@@ -0,0 +1,38 @@
+var lodash = require('./wrapperLodash');
+
+/**
+ * Creates a `lodash` wrapper instance that wraps `value` with explicit method
+ * chain sequences enabled. The result of such sequences must be unwrapped
+ * with `_#value`.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.3.0
+ * @category Seq
+ * @param {*} value The value to wrap.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney',  'age': 36 },
+ *   { 'user': 'fred',    'age': 40 },
+ *   { 'user': 'pebbles', 'age': 1 }
+ * ];
+ *
+ * var youngest = _
+ *   .chain(users)
+ *   .sortBy('age')
+ *   .map(function(o) {
+ *     return o.user + ' is ' + o.age;
+ *   })
+ *   .head()
+ *   .value();
+ * // => 'pebbles is 1'
+ */
+function chain(value) {
+  var result = lodash(value);
+  result.__chain__ = true;
+  return result;
+}
+
+module.exports = chain;