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/README.md

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+# for-each [![build status][1]][2]
+
+[![browser support][3]][4]
+
+A better forEach.
+
+## Example
+
+Like `Array.prototype.forEach` but works on objects.
+
+```js
+var forEach = require("for-each")
+
+forEach({ key: "value" }, function (value, key, object) {
+    /* code */
+})
+```
+
+As a bonus, it's also a perfectly function shim/polyfill for arrays too!
+
+```js
+var forEach = require("for-each")
+
+forEach([1, 2, 3], function (value, index, array) {
+    /* code */
+})
+```
+
+## Installation
+
+`npm install for-each`
+
+## MIT Licenced
+
+  [1]: https://secure.travis-ci.org/Raynos/for-each.png
+  [2]: http://travis-ci.org/Raynos/for-each
+  [3]: https://ci.testling.com/Raynos/for-each.png
+  [4]: https://ci.testling.com/Raynos/for-each
+