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/jakelib/publish.jake.js

@@ -0,0 +1,49 @@
+/*
+ * Jake JavaScript build tool
+ * Copyright 2112 Matthew Eernisse (mde@fleegix.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+*/
+
+const PROJECT_DIR = process.env.PROJECT_DIR;
+
+let fs = require('fs');
+let { publishTask, rmRf, mkdirP } = require(`${PROJECT_DIR}/lib/jake`);
+
+fs.writeFileSync('package.json', '{"version": "0.0.1"}');
+mkdirP('tmp_publish');
+fs.writeFileSync('tmp_publish/foo.txt', 'FOO');
+
+publishTask('zerb', function () {
+  this.packageFiles.include([
+    'package.json'
+    , 'tmp_publish/**'
+  ]);
+  this.publishCmd = 'node -p -e "\'%filename\'"';
+  this.gitCmd = 'echo';
+  this.scheduleDelay = 0;
+
+  this._ensureRepoClean = function () {};
+  this._getCurrentBranch = function () {
+    return 'v0.0';
+  };
+});
+
+jake.setTaskTimeout(5000);
+
+jake.Task['publish'].on('complete', function () {
+  rmRf('tmp_publish', {silent: true});
+  rmRf('package.json', {silent: true});
+});
+