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-define-property/test/index.js

@@ -0,0 +1,56 @@
+'use strict';
+
+var $defineProperty = require('../');
+
+var test = require('tape');
+var gOPD = require('gopd');
+
+test('defineProperty: supported', { skip: !$defineProperty }, function (t) {
+	t.plan(4);
+
+	t.equal(typeof $defineProperty, 'function', 'defineProperty is supported');
+	if ($defineProperty && gOPD) { // this `if` check is just to shut TS up
+		/** @type {{ a: number, b?: number, c?: number }} */
+		var o = { a: 1 };
+
+		$defineProperty(o, 'b', { enumerable: true, value: 2 });
+		t.deepEqual(
+			gOPD(o, 'b'),
+			{
+				configurable: false,
+				enumerable: true,
+				value: 2,
+				writable: false
+			},
+			'property descriptor is as expected'
+		);
+
+		$defineProperty(o, 'c', { enumerable: false, value: 3, writable: true });
+		t.deepEqual(
+			gOPD(o, 'c'),
+			{
+				configurable: false,
+				enumerable: false,
+				value: 3,
+				writable: true
+			},
+			'property descriptor is as expected'
+		);
+	}
+
+	t.equal($defineProperty, Object.defineProperty, 'defineProperty is Object.defineProperty');
+
+	t.end();
+});
+
+test('defineProperty: not supported', { skip: !!$defineProperty }, function (t) {
+	t.notOk($defineProperty, 'defineProperty is not supported');
+
+	t.match(
+		typeof $defineProperty,
+		/^(?:undefined|boolean)$/,
+		'`typeof defineProperty` is `undefined` or `boolean`'
+	);
+
+	t.end();
+});