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/object-inspect/test/global.js

@@ -0,0 +1,17 @@
+'use strict';
+
+var inspect = require('../');
+
+var test = require('tape');
+var globalThis = require('globalthis')();
+
+test('global object', function (t) {
+    /* eslint-env browser */
+    var expected = typeof window === 'undefined' ? 'globalThis' : 'Window';
+    t.equal(
+        inspect([globalThis]),
+        '[ { [object ' + expected + '] } ]'
+    );
+
+    t.end();
+});