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/browser.d.ts

@@ -0,0 +1,63 @@
+import { C as CoverageProvider, b as CoverageProviderModule } from './chunks/reporters.nr4dxCkA.js';
+import { a as SerializedCoverageConfig, S as SerializedConfig } from './chunks/config.Cy0C388Z.js';
+import * as spy$1 from '@vitest/spy';
+import { DiffOptions } from '@vitest/expect';
+import { VitestExecutor } from './execute.js';
+export { collectTests, processError, startTests } from '@vitest/runner';
+import './chunks/environment.LoooBwUu.js';
+import 'node:stream';
+import 'vite';
+import '@vitest/utils';
+import '@vitest/pretty-format';
+import '@vitest/snapshot';
+import 'vite-node';
+import 'chai';
+import '@vitest/utils/source-map';
+import 'vite-node/client';
+import 'vite-node/server';
+import './chunks/benchmark.geERunq4.js';
+import '@vitest/runner/utils';
+import 'tinybench';
+import '@vitest/snapshot/manager';
+import 'node:fs';
+import '@vitest/snapshot/environment';
+import './chunks/worker.tN5KGIih.js';
+import 'node:vm';
+import '@vitest/mocker';
+import './chunks/mocker.cRtM890J.js';
+
+function _mergeNamespaces(n, m) {
+  m.forEach(function (e) {
+    e && typeof e !== 'string' && !Array.isArray(e) && Object.keys(e).forEach(function (k) {
+      if (k !== 'default' && !(k in n)) {
+        var d = Object.getOwnPropertyDescriptor(e, k);
+        Object.defineProperty(n, k, d.get ? d : {
+          enumerable: true,
+          get: function () { return e[k]; }
+        });
+      }
+    });
+  });
+  return Object.freeze(n);
+}
+
+var spy = /*#__PURE__*/_mergeNamespaces({
+  __proto__: null
+}, [spy$1]);
+
+interface Loader {
+    executeId: (id: string) => Promise<{
+        default: CoverageProviderModule;
+    }>;
+    isBrowser?: boolean;
+}
+declare function getCoverageProvider(options: SerializedCoverageConfig | undefined, loader: Loader): Promise<CoverageProvider | null>;
+declare function startCoverageInsideWorker(options: SerializedCoverageConfig | undefined, loader: Loader): Promise<unknown>;
+declare function takeCoverageInsideWorker(options: SerializedCoverageConfig | undefined, loader: Loader): Promise<unknown>;
+declare function stopCoverageInsideWorker(options: SerializedCoverageConfig | undefined, loader: Loader): Promise<unknown>;
+
+declare function setupCommonEnv(config: SerializedConfig): Promise<void>;
+declare function loadDiffConfig(config: SerializedConfig, executor: VitestExecutor): Promise<DiffOptions | undefined>;
+declare function loadSnapshotSerializers(config: SerializedConfig, executor: VitestExecutor): Promise<void>;
+
+export { spy as SpyModule, getCoverageProvider, loadDiffConfig, loadSnapshotSerializers, setupCommonEnv, startCoverageInsideWorker, stopCoverageInsideWorker, takeCoverageInsideWorker };