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-background-sync/lib/QueueStore.d.ts

@@ -0,0 +1,83 @@
+import { UnidentifiedQueueStoreEntry, QueueStoreEntry } from './QueueDb.js';
+import '../_version.js';
+/**
+ * A class to manage storing requests from a Queue in IndexedDB,
+ * indexed by their queue name for easier access.
+ *
+ * Most developers will not need to access this class directly;
+ * it is exposed for advanced use cases.
+ */
+export declare class QueueStore {
+    private readonly _queueName;
+    private readonly _queueDb;
+    /**
+     * Associates this instance with a Queue instance, so entries added can be
+     * identified by their queue name.
+     *
+     * @param {string} queueName
+     */
+    constructor(queueName: string);
+    /**
+     * Append an entry last in the queue.
+     *
+     * @param {Object} entry
+     * @param {Object} entry.requestData
+     * @param {number} [entry.timestamp]
+     * @param {Object} [entry.metadata]
+     */
+    pushEntry(entry: UnidentifiedQueueStoreEntry): Promise<void>;
+    /**
+     * Prepend an entry first in the queue.
+     *
+     * @param {Object} entry
+     * @param {Object} entry.requestData
+     * @param {number} [entry.timestamp]
+     * @param {Object} [entry.metadata]
+     */
+    unshiftEntry(entry: UnidentifiedQueueStoreEntry): Promise<void>;
+    /**
+     * Removes and returns the last entry in the queue matching the `queueName`.
+     *
+     * @return {Promise<QueueStoreEntry|undefined>}
+     */
+    popEntry(): Promise<QueueStoreEntry | undefined>;
+    /**
+     * Removes and returns the first entry in the queue matching the `queueName`.
+     *
+     * @return {Promise<QueueStoreEntry|undefined>}
+     */
+    shiftEntry(): Promise<QueueStoreEntry | undefined>;
+    /**
+     * Returns all entries in the store matching the `queueName`.
+     *
+     * @param {Object} options See {@link workbox-background-sync.Queue~getAll}
+     * @return {Promise<Array<Object>>}
+     */
+    getAll(): Promise<QueueStoreEntry[]>;
+    /**
+     * Returns the number of entries in the store matching the `queueName`.
+     *
+     * @param {Object} options See {@link workbox-background-sync.Queue~size}
+     * @return {Promise<number>}
+     */
+    size(): Promise<number>;
+    /**
+     * Deletes the entry for the given ID.
+     *
+     * WARNING: this method does not ensure the deleted entry belongs to this
+     * queue (i.e. matches the `queueName`). But this limitation is acceptable
+     * as this class is not publicly exposed. An additional check would make
+     * this method slower than it needs to be.
+     *
+     * @param {number} id
+     */
+    deleteEntry(id: number): Promise<void>;
+    /**
+     * Removes and returns the first or last entry in the queue (based on the
+     * `direction` argument) matching the `queueName`.
+     *
+     * @return {Promise<QueueStoreEntry|undefined>}
+     * @private
+     */
+    _removeEntry(entry?: QueueStoreEntry): Promise<QueueStoreEntry | undefined>;
+}