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/helper-define-polyfill-provider/lib/node/dependencies.js

@@ -0,0 +1,67 @@
+"use strict";
+
+exports.__esModule = true;
+exports.has = has;
+exports.laterLogMissing = laterLogMissing;
+exports.logMissing = logMissing;
+exports.resolve = resolve;
+var _path = _interopRequireDefault(require("path"));
+var _lodash = _interopRequireDefault(require("lodash.debounce"));
+var _resolve = _interopRequireDefault(require("resolve"));
+var _module = require("module");
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+const nativeRequireResolve = parseFloat(process.versions.node) >= 8.9;
+// eslint-disable-line
+
+function myResolve(name, basedir) {
+  if (nativeRequireResolve) {
+    return require.resolve(name, {
+      paths: [basedir]
+    }).replace(/\\/g, "/");
+  } else {
+    return _resolve.default.sync(name, {
+      basedir
+    }).replace(/\\/g, "/");
+  }
+}
+function resolve(dirname, moduleName, absoluteImports) {
+  if (absoluteImports === false) return moduleName;
+  let basedir = dirname;
+  if (typeof absoluteImports === "string") {
+    basedir = _path.default.resolve(basedir, absoluteImports);
+  }
+  try {
+    return myResolve(moduleName, basedir);
+  } catch (err) {
+    if (err.code !== "MODULE_NOT_FOUND") throw err;
+    throw Object.assign(new Error(`Failed to resolve "${moduleName}" relative to "${dirname}"`), {
+      code: "BABEL_POLYFILL_NOT_FOUND",
+      polyfill: moduleName,
+      dirname
+    });
+  }
+}
+function has(basedir, name) {
+  try {
+    myResolve(name, basedir);
+    return true;
+  } catch (_unused) {
+    return false;
+  }
+}
+function logMissing(missingDeps) {
+  if (missingDeps.size === 0) return;
+  const deps = Array.from(missingDeps).sort().join(" ");
+  console.warn("\nSome polyfills have been added but are not present in your dependencies.\n" + "Please run one of the following commands:\n" + `\tnpm install --save ${deps}\n` + `\tyarn add ${deps}\n`);
+  process.exitCode = 1;
+}
+let allMissingDeps = new Set();
+const laterLogMissingDependencies = (0, _lodash.default)(() => {
+  logMissing(allMissingDeps);
+  allMissingDeps = new Set();
+}, 100);
+function laterLogMissing(missingDeps) {
+  if (missingDeps.size === 0) return;
+  missingDeps.forEach(name => allMissingDeps.add(name));
+  laterLogMissingDependencies();
+}