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/workbox-precaching/utils/printCleanupDetails.js

@@ -0,0 +1,38 @@
+/*
+  Copyright 2018 Google LLC
+
+  Use of this source code is governed by an MIT-style
+  license that can be found in the LICENSE file or at
+  https://opensource.org/licenses/MIT.
+*/
+import { logger } from 'workbox-core/_private/logger.js';
+import '../_version.js';
+/**
+ * @param {string} groupTitle
+ * @param {Array<string>} deletedURLs
+ *
+ * @private
+ */
+const logGroup = (groupTitle, deletedURLs) => {
+    logger.groupCollapsed(groupTitle);
+    for (const url of deletedURLs) {
+        logger.log(url);
+    }
+    logger.groupEnd();
+};
+/**
+ * @param {Array<string>} deletedURLs
+ *
+ * @private
+ * @memberof workbox-precaching
+ */
+export function printCleanupDetails(deletedURLs) {
+    const deletionCount = deletedURLs.length;
+    if (deletionCount > 0) {
+        logger.groupCollapsed(`During precaching cleanup, ` +
+            `${deletionCount} cached ` +
+            `request${deletionCount === 1 ? ' was' : 's were'} deleted.`);
+        logGroup('Deleted Cache Requests', deletedURLs);
+        logger.groupEnd();
+    }
+}