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/benchmark.geERunq4.d.ts

@@ -0,0 +1,24 @@
+import { Custom } from '@vitest/runner';
+import { ChainableFunction } from '@vitest/runner/utils';
+import { TaskResult, Bench, Options } from 'tinybench';
+
+interface Benchmark extends Custom {
+    meta: {
+        benchmark: true;
+        result?: TaskResult;
+    };
+}
+interface BenchmarkResult extends TaskResult {
+    name: string;
+    rank: number;
+    sampleCount: number;
+    median: number;
+}
+type BenchFunction = (this: Bench) => Promise<void> | void;
+type ChainableBenchmarkAPI = ChainableFunction<'skip' | 'only' | 'todo', (name: string | Function, fn?: BenchFunction, options?: Options) => void>;
+type BenchmarkAPI = ChainableBenchmarkAPI & {
+    skipIf: (condition: any) => ChainableBenchmarkAPI;
+    runIf: (condition: any) => ChainableBenchmarkAPI;
+};
+
+export type { BenchmarkResult as B, BenchFunction as a, Benchmark as b, BenchmarkAPI as c };