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/stop-iteration-iterator/test/index.js

@@ -0,0 +1,51 @@
+'use strict';
+
+var test = require('tape');
+
+var stopIterationIterator = require('../');
+
+test('stopIterationIterator', function (t) {
+	t.equal(typeof stopIterationIterator, 'function', 'stopIterationIterator is a function');
+
+	t.test('no StopIteration support', { skip: typeof StopIteration === 'object' }, function (st) {
+		st['throws'](
+			// @ts-expect-error
+			function () { stopIterationIterator(); },
+			SyntaxError,
+			'throws a SyntaxError when StopIteration is not supported'
+		);
+
+		st.end();
+	});
+
+	t.test('StopIteration support', { skip: typeof StopIteration !== 'object' }, function (st) {
+		// eslint-disable-next-line no-extra-parens
+		var s = /** @type {Set<number> & { iterator(): SetIterator<number>}} */ (new Set([1, 2]));
+
+		var i = s.iterator();
+		st.equal(i.next(), 1, 'first item is 1');
+		st.equal(i.next(), 2, 'second item is 2');
+		try {
+			i.next();
+			st.fail();
+		} catch (e) {
+			st.equal(e, StopIteration, 'StopIteration thrown');
+		}
+
+		// eslint-disable-next-line no-extra-parens
+		var m = /** @type {Map<number, string> & { iterator(): MapIterator<[string, number]>}} */ (new Map([[1, 'a'], [2, 'b']]));
+		var mi = m.iterator();
+		st.deepEqual(mi.next(), [1, 'a'], 'first item is 1 and a');
+		st.deepEqual(mi.next(), [2, 'b'], 'second item is 2 and b');
+		try {
+			mi.next();
+			st.fail();
+		} catch (e) {
+			st.equal(e, StopIteration, 'StopIteration thrown');
+		}
+
+		st.end();
+	});
+
+	t.end();
+});