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/trimEnd.js

@@ -0,0 +1,41 @@
+var baseToString = require('./_baseToString'),
+    castSlice = require('./_castSlice'),
+    charsEndIndex = require('./_charsEndIndex'),
+    stringToArray = require('./_stringToArray'),
+    toString = require('./toString'),
+    trimmedEndIndex = require('./_trimmedEndIndex');
+
+/**
+ * Removes trailing whitespace or specified characters from `string`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category String
+ * @param {string} [string=''] The string to trim.
+ * @param {string} [chars=whitespace] The characters to trim.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {string} Returns the trimmed string.
+ * @example
+ *
+ * _.trimEnd('  abc  ');
+ * // => '  abc'
+ *
+ * _.trimEnd('-_-abc-_-', '_-');
+ * // => '-_-abc'
+ */
+function trimEnd(string, chars, guard) {
+  string = toString(string);
+  if (string && (guard || chars === undefined)) {
+    return string.slice(0, trimmedEndIndex(string) + 1);
+  }
+  if (!string || !(chars = baseToString(chars))) {
+    return string;
+  }
+  var strSymbols = stringToArray(string),
+      end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;
+
+  return castSlice(strSymbols, 0, end).join('');
+}
+
+module.exports = trimEnd;