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/for-each/index.js

@@ -0,0 +1,69 @@
+'use strict';
+
+var isCallable = require('is-callable');
+
+var toStr = Object.prototype.toString;
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+
+/** @type {<This, A extends readonly unknown[]>(arr: A, iterator: (this: This | void, value: A[number], index: number, arr: A) => void, receiver: This | undefined) => void} */
+var forEachArray = function forEachArray(array, iterator, receiver) {
+    for (var i = 0, len = array.length; i < len; i++) {
+        if (hasOwnProperty.call(array, i)) {
+            if (receiver == null) {
+                iterator(array[i], i, array);
+            } else {
+                iterator.call(receiver, array[i], i, array);
+            }
+        }
+    }
+};
+
+/** @type {<This, S extends string>(string: S, iterator: (this: This | void, value: S[number], index: number, string: S) => void, receiver: This | undefined) => void} */
+var forEachString = function forEachString(string, iterator, receiver) {
+    for (var i = 0, len = string.length; i < len; i++) {
+        // no such thing as a sparse string.
+        if (receiver == null) {
+            iterator(string.charAt(i), i, string);
+        } else {
+            iterator.call(receiver, string.charAt(i), i, string);
+        }
+    }
+};
+
+/** @type {<This, O>(obj: O, iterator: (this: This | void, value: O[keyof O], index: keyof O, obj: O) => void, receiver: This | undefined) => void} */
+var forEachObject = function forEachObject(object, iterator, receiver) {
+    for (var k in object) {
+        if (hasOwnProperty.call(object, k)) {
+            if (receiver == null) {
+                iterator(object[k], k, object);
+            } else {
+                iterator.call(receiver, object[k], k, object);
+            }
+        }
+    }
+};
+
+/** @type {(x: unknown) => x is readonly unknown[]} */
+function isArray(x) {
+    return toStr.call(x) === '[object Array]';
+}
+
+/** @type {import('.')._internal} */
+module.exports = function forEach(list, iterator, thisArg) {
+    if (!isCallable(iterator)) {
+        throw new TypeError('iterator must be a function');
+    }
+
+    var receiver;
+    if (arguments.length >= 3) {
+        receiver = thisArg;
+    }
+
+    if (isArray(list)) {
+        forEachArray(list, iterator, receiver);
+    } else if (typeof list === 'string') {
+        forEachString(list, iterator, receiver);
+    } else {
+        forEachObject(list, iterator, receiver);
+    }
+};