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/es-abstract/2020/CreateListFromArrayLike.js

@@ -0,0 +1,46 @@
+'use strict';
+
+var callBound = require('call-bound');
+
+var $TypeError = require('es-errors/type');
+var isObject = require('es-object-atoms/isObject');
+var $indexOf = callBound('Array.prototype.indexOf', true) || callBound('String.prototype.indexOf');
+
+var Get = require('./Get');
+var IsArray = require('./IsArray');
+var LengthOfArrayLike = require('./LengthOfArrayLike');
+var ToString = require('./ToString');
+var Type = require('./Type');
+
+var defaultElementTypes = ['Undefined', 'Null', 'Boolean', 'String', 'Symbol', 'Number', 'BigInt', 'Object'];
+
+// https://262.ecma-international.org/11.0/#sec-createlistfromarraylike
+
+/** @type {(obj: object, elementTypes?: typeof defaultElementTypes) => unknown[]} */
+module.exports = function CreateListFromArrayLike(obj) {
+	var elementTypes = arguments.length > 1
+		? arguments[1]
+		: defaultElementTypes;
+
+	if (!isObject(obj)) {
+		throw new $TypeError('Assertion failed: `obj` must be an Object');
+	}
+	if (!IsArray(elementTypes)) {
+		throw new $TypeError('Assertion failed: `elementTypes`, if provided, must be an array');
+	}
+	var len = LengthOfArrayLike(obj);
+	/** @type {(typeof elementTypes)[]} */
+	var list = [];
+	var index = 0;
+	while (index < len) {
+		var indexName = ToString(index);
+		var next = Get(obj, indexName);
+		var nextType = Type(next);
+		if ($indexOf(elementTypes, nextType) < 0) {
+			throw new $TypeError('item type ' + nextType + ' is not a valid elementType');
+		}
+		list[list.length] = next;
+		index += 1;
+	}
+	return list;
+};