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/set-proto/test/index.js

@@ -0,0 +1,40 @@
+'use strict';
+
+var test = require('tape');
+
+var setProto = require('../');
+
+var isPrototypeOf = Object.prototype.isPrototypeOf;
+
+test('setProto', function (t) {
+	t.equal(typeof setProto, 'function', 'is a function');
+
+	t.test('can set', { skip: !setProto }, function (st) {
+		var obj = { a: 1 };
+		var proto = { b: 2 };
+
+		st.ok(isPrototypeOf.call(Object.prototype, obj), 'Object.prototype is isPrototypeOf obj');
+		st.notOk(isPrototypeOf.call(proto, obj), 'proto is not isPrototypeOf obj');
+		st.ok('a' in obj, 'a is in obj');
+		st.notOk('b' in obj, 'b is not in obj');
+
+		// eslint-disable-next-line no-extra-parens
+		st.equal(/** @type {NonNullable<typeof setProto>} */ (setProto)(obj, proto), obj, 'returns the object');
+
+		st.ok(isPrototypeOf.call(Object.prototype, obj), 'Object.prototype is isPrototypeOf obj');
+		st.ok(isPrototypeOf.call(proto, obj), 'proto is isPrototypeOf obj');
+		st.ok('a' in obj, 'a is in obj');
+		st.ok('b' in obj, 'b is in obj');
+
+		st.equal(Object.getPrototypeOf(obj), proto, 'sets the prototype');
+		st.end();
+	});
+
+	t.test('can not set', { skip: !!setProto }, function (st) {
+		st.equal(setProto, null);
+
+		st.end();
+	});
+
+	t.end();
+});