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/tinypool/dist/common-Qw-RoVFD.js

@@ -0,0 +1,28 @@
+//#region src/common.ts
+const kMovable = Symbol("Tinypool.kMovable");
+const kTransferable = Symbol.for("Tinypool.transferable");
+const kValue = Symbol.for("Tinypool.valueOf");
+const kQueueOptions = Symbol.for("Tinypool.queueOptions");
+function isTransferable(value) {
+	return value != null && typeof value === "object" && kTransferable in value && kValue in value;
+}
+function isMovable(value) {
+	return isTransferable(value) && value[kMovable] === true;
+}
+function markMovable(value) {
+	Object.defineProperty(value, kMovable, {
+		enumerable: false,
+		configurable: true,
+		writable: true,
+		value: true
+	});
+}
+function isTaskQueue(value) {
+	return typeof value === "object" && value !== null && "size" in value && typeof value.shift === "function" && typeof value.remove === "function" && typeof value.push === "function";
+}
+const kRequestCountField = 0;
+const kResponseCountField = 1;
+const kFieldCount = 2;
+
+//#endregion
+export { isMovable, isTaskQueue, isTransferable, kFieldCount, kQueueOptions, kRequestCountField, kResponseCountField, kTransferable, kValue, markMovable };