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/reporters.js

@@ -0,0 +1,28 @@
+export { B as BasicReporter, h as BenchmarkReportsMap, D as DefaultReporter, a as DotReporter, G as GithubActionsReporter, H as HangingProcessReporter, b as JUnitReporter, J as JsonReporter, R as ReportersMap, T as TapFlatReporter, c as TapReporter, e as TestCase, d as TestFile, f as TestModule, g as TestSuite, V as VerboseReporter } from './chunks/index.DsZFoqi9.js';
+import 'node:fs';
+import '@vitest/runner/utils';
+import 'pathe';
+import 'tinyrainbow';
+import './chunks/utils.DNoFbBUZ.js';
+import 'node:util';
+import '@vitest/utils';
+import 'node:perf_hooks';
+import '@vitest/utils/source-map';
+import './chunks/RandomSequencer.CMRlh2v4.js';
+import 'std-env';
+import 'node:fs/promises';
+import 'tinyexec';
+import 'vite';
+import 'node:os';
+import 'node:url';
+import 'node:path';
+import 'node:module';
+import 'fs';
+import 'vite-node/utils';
+import 'node:crypto';
+import 'node:stream';
+import 'node:console';
+import 'node:process';
+import './chunks/_commonjsHelpers.BFTU3MAI.js';
+import 'assert';
+import 'events';