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/CreateRegExpStringIterator.js

@@ -0,0 +1,100 @@
+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+var hasSymbols = require('has-symbols')();
+
+var $TypeError = require('es-errors/type');
+var isObject = require('es-object-atoms/isObject');
+var IteratorPrototype = GetIntrinsic('%IteratorPrototype%', true);
+
+var AdvanceStringIndex = require('./AdvanceStringIndex');
+var CreateIterResultObject = require('./CreateIterResultObject');
+var CreateMethodProperty = require('./CreateMethodProperty');
+var Get = require('./Get');
+var OrdinaryObjectCreate = require('./OrdinaryObjectCreate');
+var RegExpExec = require('./RegExpExec');
+var Set = require('./Set');
+var ToLength = require('./ToLength');
+var ToString = require('./ToString');
+
+var SLOT = require('internal-slot');
+var setToStringTag = require('es-set-tostringtag');
+
+var RegExpStringIterator = function RegExpStringIterator(R, S, global, fullUnicode) {
+	if (typeof S !== 'string') {
+		throw new $TypeError('`S` must be a string');
+	}
+	if (typeof global !== 'boolean') {
+		throw new $TypeError('`global` must be a boolean');
+	}
+	if (typeof fullUnicode !== 'boolean') {
+		throw new $TypeError('`fullUnicode` must be a boolean');
+	}
+	SLOT.set(this, '[[IteratingRegExp]]', R);
+	SLOT.set(this, '[[IteratedString]]', S);
+	SLOT.set(this, '[[Global]]', global);
+	SLOT.set(this, '[[Unicode]]', fullUnicode);
+	SLOT.set(this, '[[Done]]', false);
+};
+
+if (IteratorPrototype) {
+	RegExpStringIterator.prototype = OrdinaryObjectCreate(IteratorPrototype);
+}
+
+var RegExpStringIteratorNext = function next() {
+	var O = this;
+	if (!isObject(O)) {
+		throw new $TypeError('receiver must be an object');
+	}
+	if (
+		!(O instanceof RegExpStringIterator)
+		|| !SLOT.has(O, '[[IteratingRegExp]]')
+		|| !SLOT.has(O, '[[IteratedString]]')
+		|| !SLOT.has(O, '[[Global]]')
+		|| !SLOT.has(O, '[[Unicode]]')
+		|| !SLOT.has(O, '[[Done]]')
+	) {
+		throw new $TypeError('"this" value must be a RegExpStringIterator instance');
+	}
+	if (SLOT.get(O, '[[Done]]')) {
+		return CreateIterResultObject(undefined, true);
+	}
+	var R = SLOT.get(O, '[[IteratingRegExp]]');
+	var S = SLOT.get(O, '[[IteratedString]]');
+	var global = SLOT.get(O, '[[Global]]');
+	var fullUnicode = SLOT.get(O, '[[Unicode]]');
+	var match = RegExpExec(R, S);
+	if (match === null) {
+		SLOT.set(O, '[[Done]]', true);
+		return CreateIterResultObject(undefined, true);
+	}
+	if (global) {
+		var matchStr = ToString(Get(match, '0'));
+		if (matchStr === '') {
+			var thisIndex = ToLength(Get(R, 'lastIndex'));
+			var nextIndex = AdvanceStringIndex(S, thisIndex, fullUnicode);
+			Set(R, 'lastIndex', nextIndex, true);
+		}
+		return CreateIterResultObject(match, false);
+	}
+	SLOT.set(O, '[[Done]]', true);
+	return CreateIterResultObject(match, false);
+};
+CreateMethodProperty(RegExpStringIterator.prototype, 'next', RegExpStringIteratorNext);
+
+if (hasSymbols) {
+	setToStringTag(RegExpStringIterator.prototype, 'RegExp String Iterator');
+
+	if (Symbol.iterator && typeof RegExpStringIterator.prototype[Symbol.iterator] !== 'function') {
+		var iteratorFn = function SymbolIterator() {
+			return this;
+		};
+		CreateMethodProperty(RegExpStringIterator.prototype, Symbol.iterator, iteratorFn);
+	}
+}
+
+// https://262.ecma-international.org/11.0/#sec-createregexpstringiterator
+module.exports = function CreateRegExpStringIterator(R, S, global, fullUnicode) {
+	// assert R.global === global && R.unicode === fullUnicode?
+	return new RegExpStringIterator(R, S, global, fullUnicode);
+};