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/propertyOf.js

@@ -0,0 +1,30 @@
+var baseGet = require('./_baseGet');
+
+/**
+ * The opposite of `_.property`; this method creates a function that returns
+ * the value at a given path of `object`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Util
+ * @param {Object} object The object to query.
+ * @returns {Function} Returns the new accessor function.
+ * @example
+ *
+ * var array = [0, 1, 2],
+ *     object = { 'a': array, 'b': array, 'c': array };
+ *
+ * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
+ * // => [2, 0]
+ *
+ * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
+ * // => [2, 0]
+ */
+function propertyOf(object) {
+  return function(path) {
+    return object == null ? undefined : baseGet(object, path);
+  };
+}
+
+module.exports = propertyOf;