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-strategies/utils/messages.d.ts

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+import '../_version.js';
+export declare const messages: {
+    strategyStart: (strategyName: string, request: Request) => string;
+    printFinalResponse: (response?: Response) => void;
+};

pwa/node_modules/workbox-strategies/utils/messages.js

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+/*
+  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 { getFriendlyURL } from 'workbox-core/_private/getFriendlyURL.js';
+import '../_version.js';
+export const messages = {
+    strategyStart: (strategyName, request) => `Using ${strategyName} to respond to '${getFriendlyURL(request.url)}'`,
+    printFinalResponse: (response) => {
+        if (response) {
+            logger.groupCollapsed(`View the final response here.`);
+            logger.log(response || '[No response returned]');
+            logger.groupEnd();
+        }
+    },
+};

pwa/node_modules/workbox-strategies/utils/messages.mjs

@@ -0,0 +1 @@
+export * from './messages.js';