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/async/select.js

@@ -0,0 +1,93 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+
+var _filter2 = require('./internal/filter.js');
+
+var _filter3 = _interopRequireDefault(_filter2);
+
+var _eachOf = require('./eachOf.js');
+
+var _eachOf2 = _interopRequireDefault(_eachOf);
+
+var _awaitify = require('./internal/awaitify.js');
+
+var _awaitify2 = _interopRequireDefault(_awaitify);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Returns a new array of all the values in `coll` which pass an async truth
+ * test. This operation is performed in parallel, but the results array will be
+ * in the same order as the original.
+ *
+ * @name filter
+ * @static
+ * @memberOf module:Collections
+ * @method
+ * @alias select
+ * @category Collection
+ * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+ * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+ * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+ * with a boolean argument once it has completed. Invoked with (item, callback).
+ * @param {Function} [callback] - A callback which is called after all the
+ * `iteratee` functions have finished. Invoked with (err, results).
+ * @returns {Promise} a promise, if no callback provided
+ * @example
+ *
+ * // dir1 is a directory that contains file1.txt, file2.txt
+ * // dir2 is a directory that contains file3.txt, file4.txt
+ * // dir3 is a directory that contains file5.txt
+ *
+ * const files = ['dir1/file1.txt','dir2/file3.txt','dir3/file6.txt'];
+ *
+ * // asynchronous function that checks if a file exists
+ * function fileExists(file, callback) {
+ *    fs.access(file, fs.constants.F_OK, (err) => {
+ *        callback(null, !err);
+ *    });
+ * }
+ *
+ * // Using callbacks
+ * async.filter(files, fileExists, function(err, results) {
+ *    if(err) {
+ *        console.log(err);
+ *    } else {
+ *        console.log(results);
+ *        // [ 'dir1/file1.txt', 'dir2/file3.txt' ]
+ *        // results is now an array of the existing files
+ *    }
+ * });
+ *
+ * // Using Promises
+ * async.filter(files, fileExists)
+ * .then(results => {
+ *     console.log(results);
+ *     // [ 'dir1/file1.txt', 'dir2/file3.txt' ]
+ *     // results is now an array of the existing files
+ * }).catch(err => {
+ *     console.log(err);
+ * });
+ *
+ * // Using async/await
+ * async () => {
+ *     try {
+ *         let results = await async.filter(files, fileExists);
+ *         console.log(results);
+ *         // [ 'dir1/file1.txt', 'dir2/file3.txt' ]
+ *         // results is now an array of the existing files
+ *     }
+ *     catch (err) {
+ *         console.log(err);
+ *     }
+ * }
+ *
+ */
+function filter(coll, iteratee, callback) {
+    return (0, _filter3.default)(_eachOf2.default, coll, iteratee, callback);
+}
+exports.default = (0, _awaitify2.default)(filter, 3);
+module.exports = exports.default;