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/asyncGeneratorDelegate.js

@@ -0,0 +1,24 @@
+var OverloadYield = require("./OverloadYield.js");
+function _asyncGeneratorDelegate(t) {
+  var e = {},
+    n = !1;
+  function pump(e, r) {
+    return n = !0, r = new Promise(function (n) {
+      n(t[e](r));
+    }), {
+      done: !1,
+      value: new OverloadYield(r, 1)
+    };
+  }
+  return e["undefined" != typeof Symbol && Symbol.iterator || "@@iterator"] = function () {
+    return this;
+  }, e.next = function (t) {
+    return n ? (n = !1, t) : pump("next", t);
+  }, "function" == typeof t["throw"] && (e["throw"] = function (t) {
+    if (n) throw n = !1, t;
+    return pump("throw", t);
+  }), "function" == typeof t["return"] && (e["return"] = function (t) {
+    return n ? (n = !1, t) : pump("return", t);
+  }), e;
+}
+module.exports = _asyncGeneratorDelegate, module.exports.__esModule = true, module.exports["default"] = module.exports;