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/workers.d.ts

@@ -0,0 +1,37 @@
+import { W as WorkerGlobalState, C as ContextRPC, B as BirpcOptions, R as RuntimeRPC } from './chunks/worker.tN5KGIih.js';
+import { Awaitable } from '@vitest/utils';
+import * as v8 from 'v8';
+import { S as SerializedConfig } from './chunks/config.Cy0C388Z.js';
+import { W as WorkerContext } from './chunks/worker.B9FxPCaC.js';
+import '@vitest/runner';
+import 'vite-node';
+import './chunks/environment.LoooBwUu.js';
+import '@vitest/snapshot';
+import '@vitest/pretty-format';
+import '@vitest/snapshot/environment';
+import 'node:worker_threads';
+
+declare function provideWorkerState(context: any, state: WorkerGlobalState): WorkerGlobalState;
+
+declare function run(ctx: ContextRPC): Promise<void>;
+declare function collect(ctx: ContextRPC): Promise<void>;
+
+declare function runBaseTests(method: 'run' | 'collect', state: WorkerGlobalState): Promise<void>;
+
+type WorkerRpcOptions = Pick<BirpcOptions<RuntimeRPC>, 'on' | 'post' | 'serialize' | 'deserialize'>;
+interface VitestWorker {
+    getRpcOptions: (ctx: ContextRPC) => WorkerRpcOptions;
+    runTests: (state: WorkerGlobalState) => Awaitable<unknown>;
+    collectTests: (state: WorkerGlobalState) => Awaitable<unknown>;
+}
+
+declare function createThreadsRpcOptions({ port, }: WorkerContext): WorkerRpcOptions;
+declare function createForksRpcOptions(nodeV8: typeof v8): WorkerRpcOptions;
+/**
+ * Reverts the wrapping done by `utils/config-helpers.ts`'s `wrapSerializableConfig`
+ */
+declare function unwrapSerializableConfig(config: SerializedConfig): SerializedConfig;
+
+declare function runVmTests(method: 'run' | 'collect', state: WorkerGlobalState): Promise<void>;
+
+export { type VitestWorker, type WorkerRpcOptions, collect as collectVitestWorkerTests, createForksRpcOptions, createThreadsRpcOptions, provideWorkerState, runBaseTests, run as runVitestWorker, runVmTests, unwrapSerializableConfig };