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/loupe/lib/object.js

@@ -0,0 +1,22 @@
+import { inspectList, inspectProperty } from './helpers.js';
+export default function inspectObject(object, options) {
+    const properties = Object.getOwnPropertyNames(object);
+    const symbols = Object.getOwnPropertySymbols ? Object.getOwnPropertySymbols(object) : [];
+    if (properties.length === 0 && symbols.length === 0) {
+        return '{}';
+    }
+    options.truncate -= 4;
+    options.seen = options.seen || [];
+    if (options.seen.includes(object)) {
+        return '[Circular]';
+    }
+    options.seen.push(object);
+    const propertyContents = inspectList(properties.map(key => [key, object[key]]), options, inspectProperty);
+    const symbolContents = inspectList(symbols.map(key => [key, object[key]]), options, inspectProperty);
+    options.seen.pop();
+    let sep = '';
+    if (propertyContents && symbolContents) {
+        sep = ', ';
+    }
+    return `{ ${propertyContents}${sep}${symbolContents} }`;
+}