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/forIn.js

@@ -0,0 +1,39 @@
+var baseFor = require('./_baseFor'),
+    castFunction = require('./_castFunction'),
+    keysIn = require('./keysIn');
+
+/**
+ * Iterates over own and inherited enumerable string keyed properties of an
+ * object and invokes `iteratee` for each property. The iteratee is invoked
+ * with three arguments: (value, key, object). Iteratee functions may exit
+ * iteration early by explicitly returning `false`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.3.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Object} Returns `object`.
+ * @see _.forInRight
+ * @example
+ *
+ * function Foo() {
+ *   this.a = 1;
+ *   this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.forIn(new Foo, function(value, key) {
+ *   console.log(key);
+ * });
+ * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
+ */
+function forIn(object, iteratee) {
+  return object == null
+    ? object
+    : baseFor(object, castFunction(iteratee), keysIn);
+}
+
+module.exports = forIn;