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/_baseWhile.js

@@ -0,0 +1,26 @@
+var baseSlice = require('./_baseSlice');
+
+/**
+ * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
+ * without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to query.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Array} Returns the slice of `array`.
+ */
+function baseWhile(array, predicate, isDrop, fromRight) {
+  var length = array.length,
+      index = fromRight ? length : -1;
+
+  while ((fromRight ? index-- : ++index < length) &&
+    predicate(array[index], index, array)) {}
+
+  return isDrop
+    ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
+    : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
+}
+
+module.exports = baseWhile;