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/base.BZZh4cSm.js

@@ -0,0 +1,38 @@
+import { ModuleCacheMap } from 'vite-node/client';
+import { g as getDefaultRequestStubs, s as startVitestExecutor } from './execute.2pr0rHgK.js';
+import { p as provideWorkerState } from './utils.C8RiOc4B.js';
+
+let _viteNode;
+const moduleCache = new ModuleCacheMap();
+async function startViteNode(options) {
+  if (_viteNode) {
+    return _viteNode;
+  }
+  _viteNode = await startVitestExecutor(options);
+  return _viteNode;
+}
+async function runBaseTests(method, state) {
+  const { ctx } = state;
+  state.moduleCache = moduleCache;
+  provideWorkerState(globalThis, state);
+  if (ctx.invalidates) {
+    ctx.invalidates.forEach((fsPath) => {
+      moduleCache.delete(fsPath);
+      moduleCache.delete(`mock:${fsPath}`);
+    });
+  }
+  ctx.files.forEach((i) => state.moduleCache.delete(i));
+  const [executor, { run }] = await Promise.all([
+    startViteNode({ state, requestStubs: getDefaultRequestStubs() }),
+    import('./runBaseTests.3qpJUEJM.js')
+  ]);
+  await run(
+    method,
+    ctx.files,
+    ctx.config,
+    { environment: state.environment, options: ctx.environment.options },
+    executor
+  );
+}
+
+export { runBaseTests as r };