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/@babel/runtime/helpers/createForOfIteratorHelperLoose.js

@@ -0,0 +1,19 @@
+var unsupportedIterableToArray = require("./unsupportedIterableToArray.js");
+function _createForOfIteratorHelperLoose(r, e) {
+  var t = "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"];
+  if (t) return (t = t.call(r)).next.bind(t);
+  if (Array.isArray(r) || (t = unsupportedIterableToArray(r)) || e && r && "number" == typeof r.length) {
+    t && (r = t);
+    var o = 0;
+    return function () {
+      return o >= r.length ? {
+        done: !0
+      } : {
+        done: !1,
+        value: r[o++]
+      };
+    };
+  }
+  throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+}
+module.exports = _createForOfIteratorHelperLoose, module.exports.__esModule = true, module.exports["default"] = module.exports;