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/options.js

@@ -0,0 +1,41 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.UseBuiltInsOption = exports.TopLevelOptions = exports.ModulesOption = void 0;
+const TopLevelOptions = exports.TopLevelOptions = {
+  configPath: "configPath",
+  corejs: "corejs",
+  debug: "debug",
+  exclude: "exclude",
+  forceAllTransforms: "forceAllTransforms",
+  ignoreBrowserslistConfig: "ignoreBrowserslistConfig",
+  include: "include",
+  modules: "modules",
+  shippedProposals: "shippedProposals",
+  targets: "targets",
+  useBuiltIns: "useBuiltIns",
+  browserslistEnv: "browserslistEnv"
+};
+Object.assign(TopLevelOptions, {
+  bugfixes: "bugfixes",
+  loose: "loose",
+  spec: "spec"
+});
+const ModulesOption = exports.ModulesOption = {
+  false: false,
+  auto: "auto",
+  amd: "amd",
+  commonjs: "commonjs",
+  cjs: "cjs",
+  systemjs: "systemjs",
+  umd: "umd"
+};
+const UseBuiltInsOption = exports.UseBuiltInsOption = {
+  false: false,
+  entry: "entry",
+  usage: "usage"
+};
+
+//# sourceMappingURL=options.js.map