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/rawSnapshot-CPNkto81.d.ts

@@ -0,0 +1,60 @@
+import { Plugin, OptionsReceived } from '@vitest/pretty-format';
+import { S as SnapshotEnvironment } from './environment-Ddx0EDtY.js';
+
+type SnapshotData = Record<string, string>;
+type SnapshotUpdateState = 'all' | 'new' | 'none';
+type SnapshotSerializer = Plugin;
+interface SnapshotStateOptions {
+    updateSnapshot: SnapshotUpdateState;
+    snapshotEnvironment: SnapshotEnvironment;
+    expand?: boolean;
+    snapshotFormat?: OptionsReceived;
+    resolveSnapshotPath?: (path: string, extension: string) => string;
+}
+interface SnapshotMatchOptions {
+    testName: string;
+    received: unknown;
+    key?: string;
+    inlineSnapshot?: string;
+    isInline: boolean;
+    error?: Error;
+    rawSnapshot?: RawSnapshotInfo;
+}
+interface SnapshotResult {
+    filepath: string;
+    added: number;
+    fileDeleted: boolean;
+    matched: number;
+    unchecked: number;
+    uncheckedKeys: Array<string>;
+    unmatched: number;
+    updated: number;
+}
+interface UncheckedSnapshot {
+    filePath: string;
+    keys: Array<string>;
+}
+interface SnapshotSummary {
+    added: number;
+    didUpdate: boolean;
+    failure: boolean;
+    filesAdded: number;
+    filesRemoved: number;
+    filesRemovedList: Array<string>;
+    filesUnmatched: number;
+    filesUpdated: number;
+    matched: number;
+    total: number;
+    unchecked: number;
+    uncheckedKeysByFile: Array<UncheckedSnapshot>;
+    unmatched: number;
+    updated: number;
+}
+
+interface RawSnapshotInfo {
+    file: string;
+    readonly?: boolean;
+    content?: string;
+}
+
+export type { RawSnapshotInfo as R, SnapshotStateOptions as S, UncheckedSnapshot as U, SnapshotMatchOptions as a, SnapshotResult as b, SnapshotData as c, SnapshotSerializer as d, SnapshotSummary as e, SnapshotUpdateState as f };