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/resolve/test/faulty_basedir.js

@@ -0,0 +1,29 @@
+var test = require('tape');
+var path = require('path');
+var resolve = require('../');
+
+test('faulty basedir must produce error in windows', { skip: process.platform !== 'win32' }, function (t) {
+    t.plan(1);
+
+    var resolverDir = 'C:\\a\\b\\c\\d';
+
+    resolve('tape/lib/test.js', { basedir: resolverDir }, function (err, res, pkg) {
+        t.equal(!!err, true);
+    });
+});
+
+test('non-existent basedir should not throw when preserveSymlinks is false', function (t) {
+    t.plan(2);
+
+    var opts = {
+        basedir: path.join(path.sep, 'unreal', 'path', 'that', 'does', 'not', 'exist'),
+        preserveSymlinks: false
+    };
+
+    var module = './dotdot/abc';
+
+    resolve(module, opts, function (err, res) {
+        t.equal(err.code, 'MODULE_NOT_FOUND');
+        t.equal(res, undefined);
+    });
+});