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/random.js

@@ -0,0 +1,82 @@
+var baseRandom = require('./_baseRandom'),
+    isIterateeCall = require('./_isIterateeCall'),
+    toFinite = require('./toFinite');
+
+/** Built-in method references without a dependency on `root`. */
+var freeParseFloat = parseFloat;
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMin = Math.min,
+    nativeRandom = Math.random;
+
+/**
+ * Produces a random number between the inclusive `lower` and `upper` bounds.
+ * If only one argument is provided a number between `0` and the given number
+ * is returned. If `floating` is `true`, or either `lower` or `upper` are
+ * floats, a floating-point number is returned instead of an integer.
+ *
+ * **Note:** JavaScript follows the IEEE-754 standard for resolving
+ * floating-point values which can produce unexpected results.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.7.0
+ * @category Number
+ * @param {number} [lower=0] The lower bound.
+ * @param {number} [upper=1] The upper bound.
+ * @param {boolean} [floating] Specify returning a floating-point number.
+ * @returns {number} Returns the random number.
+ * @example
+ *
+ * _.random(0, 5);
+ * // => an integer between 0 and 5
+ *
+ * _.random(5);
+ * // => also an integer between 0 and 5
+ *
+ * _.random(5, true);
+ * // => a floating-point number between 0 and 5
+ *
+ * _.random(1.2, 5.2);
+ * // => a floating-point number between 1.2 and 5.2
+ */
+function random(lower, upper, floating) {
+  if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
+    upper = floating = undefined;
+  }
+  if (floating === undefined) {
+    if (typeof upper == 'boolean') {
+      floating = upper;
+      upper = undefined;
+    }
+    else if (typeof lower == 'boolean') {
+      floating = lower;
+      lower = undefined;
+    }
+  }
+  if (lower === undefined && upper === undefined) {
+    lower = 0;
+    upper = 1;
+  }
+  else {
+    lower = toFinite(lower);
+    if (upper === undefined) {
+      upper = lower;
+      lower = 0;
+    } else {
+      upper = toFinite(upper);
+    }
+  }
+  if (lower > upper) {
+    var temp = lower;
+    lower = upper;
+    upper = temp;
+  }
+  if (floating || lower % 1 || upper % 1) {
+    var rand = nativeRandom();
+    return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
+  }
+  return baseRandom(lower, upper);
+}
+
+module.exports = random;