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/html.js

@@ -0,0 +1,42 @@
+import { inspectList, truncator } from './helpers.js';
+export function inspectAttribute([key, value], options) {
+    options.truncate -= 3;
+    if (!value) {
+        return `${options.stylize(String(key), 'yellow')}`;
+    }
+    return `${options.stylize(String(key), 'yellow')}=${options.stylize(`"${value}"`, 'string')}`;
+}
+export function inspectNodeCollection(collection, options) {
+    return inspectList(collection, options, inspectNode, '\n');
+}
+export function inspectNode(node, options) {
+    switch (node.nodeType) {
+        case 1:
+            return inspectHTML(node, options);
+        case 3:
+            return options.inspect(node.data, options);
+        default:
+            return options.inspect(node, options);
+    }
+}
+// @ts-ignore (Deno doesn't have Element)
+export default function inspectHTML(element, options) {
+    const properties = element.getAttributeNames();
+    const name = element.tagName.toLowerCase();
+    const head = options.stylize(`<${name}`, 'special');
+    const headClose = options.stylize(`>`, 'special');
+    const tail = options.stylize(`</${name}>`, 'special');
+    options.truncate -= name.length * 2 + 5;
+    let propertyContents = '';
+    if (properties.length > 0) {
+        propertyContents += ' ';
+        propertyContents += inspectList(properties.map((key) => [key, element.getAttribute(key)]), options, inspectAttribute, ' ');
+    }
+    options.truncate -= propertyContents.length;
+    const truncate = options.truncate;
+    let children = inspectNodeCollection(element.children, options);
+    if (children && children.length > truncate) {
+        children = `${truncator}(${element.children.length})`;
+    }
+    return `${head}${propertyContents}${headClose}${children}${tail}`;
+}