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/concurrent.js

@@ -0,0 +1,45 @@
+let assert = require('assert');
+let exec = require('child_process').execSync;
+
+const PROJECT_DIR = process.env.PROJECT_DIR;
+const JAKE_CMD = `${PROJECT_DIR}/bin/cli.js`;
+
+suite('concurrent', function () {
+
+  this.timeout(7000);
+
+  test(' simple concurrent prerequisites 1', function () {
+    let out = exec(`${JAKE_CMD} -q concurrent:simple1`).toString().trim();
+    assert.equal('Started A\nStarted B\nFinished B\nFinished A', out);
+  });
+
+  test(' simple concurrent prerequisites 2', function () {
+    let out = exec(`${JAKE_CMD} -q concurrent:simple2`).toString().trim();
+    assert.equal('Started C\nStarted D\nFinished C\nFinished D', out);
+  });
+
+  test(' sequential concurrent prerequisites', function () {
+    let out = exec(`${JAKE_CMD} -q concurrent:seqconcurrent`).toString().trim();
+    assert.equal('Started A\nStarted B\nFinished B\nFinished A\nStarted C\nStarted D\nFinished C\nFinished D', out);
+  });
+
+  test(' concurrent concurrent prerequisites', function () {
+    let out = exec(`${JAKE_CMD} -q concurrent:concurrentconcurrent`).toString().trim();
+    assert.equal('Started A\nStarted B\nStarted C\nStarted D\nFinished B\nFinished C\nFinished A\nFinished D', out);
+  });
+
+  test(' concurrent prerequisites with subdependency', function () {
+    let out = exec(`${JAKE_CMD} -q concurrent:subdep`).toString().trim();
+    assert.equal('Started A\nFinished A\nStarted Ba\nFinished Ba', out);
+  });
+
+  test(' failing in concurrent prerequisites', function () {
+    try {
+      exec(`${JAKE_CMD} -q concurrent:Cfail`);
+    }
+    catch(err) {
+      assert(err.message.indexOf('Command failed') > -1);
+    }
+  });
+
+});