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/vitest/dist/chunks/run-once.2ogXb3JV.js

@@ -0,0 +1,28 @@
+import { g as getWorkerState } from './utils.C8RiOc4B.js';
+
+const filesCount = /* @__PURE__ */ new Map();
+const cache = /* @__PURE__ */ new Map();
+function runOnce(fn, key) {
+  const filepath = getWorkerState().filepath || "__unknown_files__";
+  if (!key) {
+    filesCount.set(filepath, (filesCount.get(filepath) || 0) + 1);
+    key = String(filesCount.get(filepath));
+  }
+  const id = `${filepath}:${key}`;
+  if (!cache.has(id)) {
+    cache.set(id, fn());
+  }
+  return cache.get(id);
+}
+function isFirstRun() {
+  let firstRun = false;
+  runOnce(() => {
+    firstRun = true;
+  }, "__vitest_first_run__");
+  return firstRun;
+}
+function resetRunOnceCounter() {
+  filesCount.clear();
+}
+
+export { runOnce as a, isFirstRun as i, resetRunOnceCounter as r };