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/plugin-transform-member-expression-literals/lib/index.js

@@ -0,0 +1,29 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _helperPluginUtils = require("@babel/helper-plugin-utils");
+var _core = require("@babel/core");
+var _default = exports.default = (0, _helperPluginUtils.declare)(api => {
+  api.assertVersion(7);
+  return {
+    name: "transform-member-expression-literals",
+    visitor: {
+      MemberExpression: {
+        exit({
+          node
+        }) {
+          const prop = node.property;
+          if (!node.computed && _core.types.isIdentifier(prop) && !_core.types.isValidES3Identifier(prop.name)) {
+            node.property = _core.types.stringLiteral(prop.name);
+            node.computed = true;
+          }
+        }
+      }
+    }
+  };
+});
+
+//# sourceMappingURL=index.js.map

pwa/node_modules/@babel/plugin-transform-member-expression-literals/lib/index.js.map

@@ -0,0 +1 @@
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