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/toNumber.js

@@ -0,0 +1,64 @@
+var baseTrim = require('./_baseTrim'),
+    isObject = require('./isObject'),
+    isSymbol = require('./isSymbol');
+
+/** Used as references for various `Number` constants. */
+var NAN = 0 / 0;
+
+/** Used to detect bad signed hexadecimal string values. */
+var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
+
+/** Used to detect binary string values. */
+var reIsBinary = /^0b[01]+$/i;
+
+/** Used to detect octal string values. */
+var reIsOctal = /^0o[0-7]+$/i;
+
+/** Built-in method references without a dependency on `root`. */
+var freeParseInt = parseInt;
+
+/**
+ * Converts `value` to a number.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to process.
+ * @returns {number} Returns the number.
+ * @example
+ *
+ * _.toNumber(3.2);
+ * // => 3.2
+ *
+ * _.toNumber(Number.MIN_VALUE);
+ * // => 5e-324
+ *
+ * _.toNumber(Infinity);
+ * // => Infinity
+ *
+ * _.toNumber('3.2');
+ * // => 3.2
+ */
+function toNumber(value) {
+  if (typeof value == 'number') {
+    return value;
+  }
+  if (isSymbol(value)) {
+    return NAN;
+  }
+  if (isObject(value)) {
+    var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
+    value = isObject(other) ? (other + '') : other;
+  }
+  if (typeof value != 'string') {
+    return value === 0 ? value : +value;
+  }
+  value = baseTrim(value);
+  var isBinary = reIsBinary.test(value);
+  return (isBinary || reIsOctal.test(value))
+    ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
+    : (reIsBadHex.test(value) ? NAN : +value);
+}
+
+module.exports = toNumber;