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-block-scoped-functions/lib/index.js

@@ -0,0 +1,45 @@
+"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);
+  function transformStatementList(parentPath, paths) {
+    ;
+    for (const path of paths) {
+      if (!path.isFunctionDeclaration()) continue;
+      ;
+      const func = path.node;
+      const declar = _core.types.variableDeclaration("let", [_core.types.variableDeclarator(func.id, _core.types.toExpression(func))]);
+      declar._blockHoist = 2;
+      func.id = null;
+      path.replaceWith(declar);
+    }
+  }
+  return {
+    name: "transform-block-scoped-functions",
+    visitor: {
+      BlockStatement(path) {
+        const {
+          node,
+          parent
+        } = path;
+        if (_core.types.isFunction(parent, {
+          body: node
+        }) || _core.types.isExportDeclaration(parent)) {
+          return;
+        }
+        transformStatementList(path, path.get("body"));
+      },
+      SwitchCase(path) {
+        transformStatementList(path, path.get("consequent"));
+      }
+    }
+  };
+});
+
+//# sourceMappingURL=index.js.map