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/wrapperAt.js

@@ -0,0 +1,48 @@
+var LazyWrapper = require('./_LazyWrapper'),
+    LodashWrapper = require('./_LodashWrapper'),
+    baseAt = require('./_baseAt'),
+    flatRest = require('./_flatRest'),
+    isIndex = require('./_isIndex'),
+    thru = require('./thru');
+
+/**
+ * This method is the wrapper version of `_.at`.
+ *
+ * @name at
+ * @memberOf _
+ * @since 1.0.0
+ * @category Seq
+ * @param {...(string|string[])} [paths] The property paths to pick.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
+ *
+ * _(object).at(['a[0].b.c', 'a[1]']).value();
+ * // => [3, 4]
+ */
+var wrapperAt = flatRest(function(paths) {
+  var length = paths.length,
+      start = length ? paths[0] : 0,
+      value = this.__wrapped__,
+      interceptor = function(object) { return baseAt(object, paths); };
+
+  if (length > 1 || this.__actions__.length ||
+      !(value instanceof LazyWrapper) || !isIndex(start)) {
+    return this.thru(interceptor);
+  }
+  value = value.slice(start, +start + (length ? 1 : 0));
+  value.__actions__.push({
+    'func': thru,
+    'args': [interceptor],
+    'thisArg': undefined
+  });
+  return new LodashWrapper(value, this.__chain__).thru(function(array) {
+    if (length && !array.length) {
+      array.push(undefined);
+    }
+    return array;
+  });
+});
+
+module.exports = wrapperAt;