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/rpc.C3q9uwRX.js

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+import { getSafeTimers } from '@vitest/utils';
+import { c as createBirpc } from './index.68735LiX.js';
+import { g as getWorkerState } from './utils.C8RiOc4B.js';
+
+const { get } = Reflect;
+function withSafeTimers(fn) {
+  const { setTimeout, clearTimeout, nextTick, setImmediate, clearImmediate } = getSafeTimers();
+  const currentSetTimeout = globalThis.setTimeout;
+  const currentClearTimeout = globalThis.clearTimeout;
+  const currentSetImmediate = globalThis.setImmediate;
+  const currentClearImmediate = globalThis.clearImmediate;
+  const currentNextTick = globalThis.process?.nextTick;
+  try {
+    globalThis.setTimeout = setTimeout;
+    globalThis.clearTimeout = clearTimeout;
+    globalThis.setImmediate = setImmediate;
+    globalThis.clearImmediate = clearImmediate;
+    if (globalThis.process) {
+      globalThis.process.nextTick = nextTick;
+    }
+    const result = fn();
+    return result;
+  } finally {
+    globalThis.setTimeout = currentSetTimeout;
+    globalThis.clearTimeout = currentClearTimeout;
+    globalThis.setImmediate = currentSetImmediate;
+    globalThis.clearImmediate = currentClearImmediate;
+    if (globalThis.process) {
+      nextTick(() => {
+        globalThis.process.nextTick = currentNextTick;
+      });
+    }
+  }
+}
+const promises = /* @__PURE__ */ new Set();
+async function rpcDone() {
+  if (!promises.size) {
+    return;
+  }
+  const awaitable = Array.from(promises);
+  return Promise.all(awaitable);
+}
+function createRuntimeRpc(options) {
+  let setCancel = (_reason) => {
+  };
+  const onCancel = new Promise((resolve) => {
+    setCancel = resolve;
+  });
+  const rpc2 = createSafeRpc(
+    createBirpc(
+      {
+        onCancel: setCancel
+      },
+      {
+        eventNames: [
+          "onUserConsoleLog",
+          "onFinished",
+          "onCollected",
+          "onCancel"
+        ],
+        onTimeoutError(functionName, args) {
+          let message = `[vitest-worker]: Timeout calling "${functionName}"`;
+          if (functionName === "fetch" || functionName === "transform" || functionName === "resolveId") {
+            message += ` with "${JSON.stringify(args)}"`;
+          }
+          if (functionName === "onUnhandledError") {
+            message += ` with "${args[0]?.message || args[0]}"`;
+          }
+          throw new Error(message);
+        },
+        ...options
+      }
+    )
+  );
+  return {
+    rpc: rpc2,
+    onCancel
+  };
+}
+function createSafeRpc(rpc2) {
+  return new Proxy(rpc2, {
+    get(target, p, handler) {
+      const sendCall = get(target, p, handler);
+      const safeSendCall = (...args) => withSafeTimers(async () => {
+        const result = sendCall(...args);
+        promises.add(result);
+        try {
+          return await result;
+        } finally {
+          promises.delete(result);
+        }
+      });
+      safeSendCall.asEvent = sendCall.asEvent;
+      return safeSendCall;
+    }
+  });
+}
+function rpc() {
+  const { rpc: rpc2 } = getWorkerState();
+  return rpc2;
+}
+
+export { rpcDone as a, createRuntimeRpc as c, rpc as r };