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.d.ts

@@ -0,0 +1,35 @@
+declare function forEach<O extends readonly unknown[], This = undefined>(
+    arr: O,
+    callback: (this: This | void, value: O[number], index: number, array: O) => void,
+    thisArg?: This,
+): void;
+
+declare function forEach<O extends ArrayLike<unknown>, This = undefined>(
+    arr: O,
+    callback: (this: This | void, value: O[number], index: number, array: O) => void,
+    thisArg?: This,
+): void;
+
+declare function forEach<O extends object, This = undefined>(
+    obj: O,
+    callback: (this: This | void, value: O[keyof O], key: keyof O, obj: O) => void,
+    thisArg?: This,
+): void;
+
+declare function forEach<O extends string, This = undefined>(
+    str: O,
+    callback: (this: This | void, value: O[number], index: number, str: O) => void,
+    thisArg: This,
+): void;
+
+export = forEach;
+
+declare function forEachInternal<O, C extends (this: This | void, value: unknown, index: PropertyKey, obj: O) => void, This = undefined>(
+	value: O,
+	callback: C,
+	thisArg?: This,
+): void;
+
+declare namespace forEach {
+	export type _internal = typeof forEachInternal;
+}