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/snapshot/dist/manager.d.ts

@@ -0,0 +1,18 @@
+import { S as SnapshotStateOptions, e as SnapshotSummary, b as SnapshotResult } from './rawSnapshot-CPNkto81.js';
+import '@vitest/pretty-format';
+import './environment-Ddx0EDtY.js';
+
+declare class SnapshotManager {
+    options: Omit<SnapshotStateOptions, 'snapshotEnvironment'>;
+    summary: SnapshotSummary;
+    extension: string;
+    constructor(options: Omit<SnapshotStateOptions, 'snapshotEnvironment'>);
+    clear(): void;
+    add(result: SnapshotResult): void;
+    resolvePath(testPath: string): string;
+    resolveRawPath(testPath: string, rawPath: string): string;
+}
+declare function emptySummary(options: Omit<SnapshotStateOptions, 'snapshotEnvironment'>): SnapshotSummary;
+declare function addSnapshotResult(summary: SnapshotSummary, result: SnapshotResult): void;
+
+export { SnapshotManager, addSnapshotResult, emptySummary };