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/shipped-proposals.js

@@ -0,0 +1,29 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.proposalSyntaxPlugins = exports.proposalPlugins = exports.pluginSyntaxMap = void 0;
+const proposalPlugins = exports.proposalPlugins = new Set([]);
+const proposalSyntaxPlugins = exports.proposalSyntaxPlugins = ["syntax-import-assertions", "syntax-import-attributes"];
+const pluginSyntaxObject = {
+  "transform-async-generator-functions": "syntax-async-generators",
+  "transform-class-properties": "syntax-class-properties",
+  "transform-class-static-block": "syntax-class-static-block",
+  "transform-export-namespace-from": "syntax-export-namespace-from",
+  "transform-json-strings": "syntax-json-strings",
+  "transform-nullish-coalescing-operator": "syntax-nullish-coalescing-operator",
+  "transform-numeric-separator": "syntax-numeric-separator",
+  "transform-object-rest-spread": "syntax-object-rest-spread",
+  "transform-optional-catch-binding": "syntax-optional-catch-binding",
+  "transform-optional-chaining": "syntax-optional-chaining",
+  "transform-private-methods": "syntax-class-properties",
+  "transform-private-property-in-object": "syntax-private-property-in-object",
+  "transform-unicode-property-regex": null
+};
+const pluginSyntaxEntries = Object.keys(pluginSyntaxObject).map(function (key) {
+  return [key, pluginSyntaxObject[key]];
+});
+const pluginSyntaxMap = exports.pluginSyntaxMap = new Map(pluginSyntaxEntries);
+
+//# sourceMappingURL=shipped-proposals.js.map