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/lodash/upperCase.js

@@ -0,0 +1,27 @@
+var createCompounder = require('./_createCompounder');
+
+/**
+ * Converts `string`, as space separated words, to upper case.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the upper cased string.
+ * @example
+ *
+ * _.upperCase('--foo-bar');
+ * // => 'FOO BAR'
+ *
+ * _.upperCase('fooBar');
+ * // => 'FOO BAR'
+ *
+ * _.upperCase('__foo_bar__');
+ * // => 'FOO BAR'
+ */
+var upperCase = createCompounder(function(result, word, index) {
+  return result + (index ? ' ' : '') + word.toUpperCase();
+});
+
+module.exports = upperCase;