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/entry/worker.js

@@ -0,0 +1,76 @@
+import { isMovable, kRequestCountField, kResponseCountField, kTransferable, kValue } from "../common-Qw-RoVFD.js";
+import { stderr, stdout } from "../utils-De75vAgL.js";
+import { getHandler, throwInNextTick } from "../utils-B--2TaWv.js";
+import { parentPort, receiveMessageOnPort, workerData } from "node:worker_threads";
+
+//#region src/entry/worker.ts
+const [tinypoolPrivateData, workerData$1] = workerData;
+process.__tinypool_state__ = {
+	isWorkerThread: true,
+	isTinypoolWorker: true,
+	workerData: workerData$1,
+	workerId: tinypoolPrivateData.workerId
+};
+const memoryUsage = process.memoryUsage.bind(process);
+let useAtomics = process.env.PISCINA_DISABLE_ATOMICS !== "1";
+parentPort.on("message", (message) => {
+	useAtomics = process.env.PISCINA_DISABLE_ATOMICS === "1" ? false : message.useAtomics;
+	const { port, sharedBuffer, filename, name } = message;
+	(async function() {
+		if (filename !== null) await getHandler(filename, name);
+		const readyMessage = { ready: true };
+		parentPort.postMessage(readyMessage);
+		port.start();
+		port.on("message", onMessage.bind(null, port, sharedBuffer));
+		atomicsWaitLoop(port, sharedBuffer);
+	})().catch(throwInNextTick);
+});
+let currentTasks = 0;
+let lastSeenRequestCount = 0;
+function atomicsWaitLoop(port, sharedBuffer) {
+	if (!useAtomics) return;
+	while (currentTasks === 0) {
+		Atomics.wait(sharedBuffer, kRequestCountField, lastSeenRequestCount);
+		lastSeenRequestCount = Atomics.load(sharedBuffer, kRequestCountField);
+		let entry;
+		while ((entry = receiveMessageOnPort(port)) !== void 0) onMessage(port, sharedBuffer, entry.message);
+	}
+}
+function onMessage(port, sharedBuffer, message) {
+	currentTasks++;
+	const { taskId, task, filename, name } = message;
+	(async function() {
+		let response;
+		let transferList = [];
+		try {
+			const handler = await getHandler(filename, name);
+			if (handler === null) throw new Error(`No handler function "${name}" exported from "${filename}"`);
+			let result = await handler(task);
+			if (isMovable(result)) {
+				transferList = transferList.concat(result[kTransferable]);
+				result = result[kValue];
+			}
+			response = {
+				taskId,
+				result,
+				error: null,
+				usedMemory: memoryUsage().heapUsed
+			};
+			if (stdout()?.writableLength > 0) await new Promise((resolve) => process.stdout.write("", resolve));
+			if (stderr()?.writableLength > 0) await new Promise((resolve) => process.stderr.write("", resolve));
+		} catch (error) {
+			response = {
+				taskId,
+				result: null,
+				error,
+				usedMemory: memoryUsage().heapUsed
+			};
+		}
+		currentTasks--;
+		port.postMessage(response, transferList);
+		Atomics.add(sharedBuffer, kResponseCountField, 1);
+		atomicsWaitLoop(port, sharedBuffer);
+	})().catch(throwInNextTick);
+}
+
+//#endregion