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/jake/test/integration/helpers.js

@@ -0,0 +1,80 @@
+var exec = require('child_process').exec;
+
+var helpers = new (function () {
+  var _tests;
+  var _names = [];
+  var _name;
+  var _callback;
+  var _runner = function () {
+    if ((_name = _names.shift())) {
+      console.log('Running ' + _name);
+      _tests[_name]();
+    }
+    else {
+      _callback();
+    }
+  };
+
+  this.exec = function () {
+    var args = Array.prototype.slice.call(arguments);
+    var arg;
+    var cmd = args.shift();
+    var opts = {};
+    var callback;
+    // Optional opts/callback or callback/opts
+    while ((arg = args.shift())) {
+      if (typeof arg == 'function') {
+        callback = arg;
+      }
+      else {
+        opts = arg;
+      }
+    }
+
+    cmd += ' --trace';
+    var execOpts = opts.execOpts ? opts.execOpts : {};
+    exec(cmd, execOpts, function (err, stdout, stderr) {
+      var out = helpers.trim(stdout);
+      if (err) {
+        if (opts.breakOnError === false) {
+          return callback(err);
+        }
+        else {
+          throw err;
+        }
+      }
+      if (stderr) {
+        callback(stderr);
+      }
+      else {
+        callback(out);
+      }
+    });
+  };
+
+  this.trim = function (s) {
+    var str = s || '';
+    return str.replace(/^\s*|\s*$/g, '');
+  };
+
+  this.parse = function (s) {
+    var str = s || '';
+    str = helpers.trim(str);
+    str = str.replace(/'/g, '"');
+    return JSON.parse(str);
+  };
+
+  this.run = function (tests, callback) {
+    _tests = tests;
+    _names = Object.keys(tests);
+    _callback = callback;
+    _runner();
+  };
+
+  this.next = function () {
+    _runner();
+  };
+
+})();
+
+module.exports = helpers;