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/utils.C8RiOc4B.js

@@ -0,0 +1,77 @@
+import { getSafeTimers } from '@vitest/utils';
+
+const NAME_WORKER_STATE = "__vitest_worker__";
+function getWorkerState() {
+  const workerState = globalThis[NAME_WORKER_STATE];
+  if (!workerState) {
+    const errorMsg = 'Vitest failed to access its internal state.\n\nOne of the following is possible:\n- "vitest" is imported directly without running "vitest" command\n- "vitest" is imported inside "globalSetup" (to fix this, use "setupFiles" instead, because "globalSetup" runs in a different context)\n- Otherwise, it might be a Vitest bug. Please report it to https://github.com/vitest-dev/vitest/issues\n';
+    throw new Error(errorMsg);
+  }
+  return workerState;
+}
+function provideWorkerState(context, state) {
+  Object.defineProperty(context, NAME_WORKER_STATE, {
+    value: state,
+    configurable: true,
+    writable: true,
+    enumerable: false
+  });
+  return state;
+}
+function getCurrentEnvironment() {
+  const state = getWorkerState();
+  return state?.environment.name;
+}
+function isChildProcess() {
+  return typeof process !== "undefined" && !!process.send;
+}
+function setProcessTitle(title) {
+  try {
+    process.title = `node (${title})`;
+  } catch {
+  }
+}
+function resetModules(modules, resetMocks = false) {
+  const skipPaths = [
+    // Vitest
+    /\/vitest\/dist\//,
+    /\/vite-node\/dist\//,
+    // yarn's .store folder
+    /vitest-virtual-\w+\/dist/,
+    // cnpm
+    /@vitest\/dist/,
+    // don't clear mocks
+    ...!resetMocks ? [/^mock:/] : []
+  ];
+  modules.forEach((mod, path) => {
+    if (skipPaths.some((re) => re.test(path))) {
+      return;
+    }
+    modules.invalidateModule(mod);
+  });
+}
+function waitNextTick() {
+  const { setTimeout } = getSafeTimers();
+  return new Promise((resolve) => setTimeout(resolve, 0));
+}
+async function waitForImportsToResolve() {
+  await waitNextTick();
+  const state = getWorkerState();
+  const promises = [];
+  let resolvingCount = 0;
+  for (const mod of state.moduleCache.values()) {
+    if (mod.promise && !mod.evaluated) {
+      promises.push(mod.promise);
+    }
+    if (mod.resolving) {
+      resolvingCount++;
+    }
+  }
+  if (!promises.length && !resolvingCount) {
+    return;
+  }
+  await Promise.allSettled(promises);
+  await waitForImportsToResolve();
+}
+
+export { getCurrentEnvironment as a, getWorkerState as g, isChildProcess as i, provideWorkerState as p, resetModules as r, setProcessTitle as s, waitForImportsToResolve as w };