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/@babel/preset-env/lib/plugins-compat-data.js

@@ -0,0 +1,26 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.pluginsBugfixes = exports.plugins = exports.overlappingPlugins = void 0;
+var _availablePlugins = require("./available-plugins.js");
+const originalPlugins = require("@babel/compat-data/plugins"),
+  originalPluginsBugfixes = require("@babel/compat-data/plugin-bugfixes"),
+  originalOverlappingPlugins = require("@babel/compat-data/overlapping-plugins");
+const keys = Object.keys;
+const plugins = exports.plugins = filterAvailable(originalPlugins);
+const pluginsBugfixes = exports.pluginsBugfixes = filterAvailable(originalPluginsBugfixes);
+const overlappingPlugins = exports.overlappingPlugins = filterAvailable(originalOverlappingPlugins);
+overlappingPlugins["syntax-import-attributes"] = ["syntax-import-assertions"];
+function filterAvailable(data) {
+  const result = {};
+  for (const plugin of keys(data)) {
+    if (hasOwnProperty.call(_availablePlugins.default, plugin)) {
+      result[plugin] = data[plugin];
+    }
+  }
+  return result;
+}
+
+//# sourceMappingURL=plugins-compat-data.js.map