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/5/ToInteger.js

@@ -0,0 +1,18 @@
+'use strict';
+
+var ToNumber = require('./ToNumber');
+
+var abs = require('math-intrinsics/abs');
+var floor = require('math-intrinsics/floor');
+var $isNaN = require('math-intrinsics/isNaN');
+var $isFinite = require('math-intrinsics/isFinite');
+var $sign = require('math-intrinsics/sign');
+
+// http://262.ecma-international.org/5.1/#sec-9.4
+
+module.exports = function ToInteger(value) {
+	var number = ToNumber(value);
+	if ($isNaN(number)) { return 0; }
+	if (number === 0 || !$isFinite(number)) { return number; }
+	return $sign(number) * floor(abs(number));
+};