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-compilation-targets/lib/utils.js

@@ -0,0 +1,58 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getHighestUnreleased = getHighestUnreleased;
+exports.getLowestImplementedVersion = getLowestImplementedVersion;
+exports.getLowestUnreleased = getLowestUnreleased;
+exports.isUnreleasedVersion = isUnreleasedVersion;
+exports.semverMin = semverMin;
+exports.semverify = semverify;
+var _semver = require("semver");
+var _helperValidatorOption = require("@babel/helper-validator-option");
+var _targets = require("./targets.js");
+const versionRegExp = /^(?:\d+|\d(?:\d?[^\d\n\r\u2028\u2029]\d+|\d{2,}(?:[^\d\n\r\u2028\u2029]\d+)?))$/;
+const v = new _helperValidatorOption.OptionValidator("@babel/helper-compilation-targets");
+function semverMin(first, second) {
+  return first && _semver.lt(first, second) ? first : second;
+}
+function semverify(version) {
+  if (typeof version === "string" && _semver.valid(version)) {
+    return version;
+  }
+  v.invariant(typeof version === "number" || typeof version === "string" && versionRegExp.test(version), `'${version}' is not a valid version`);
+  version = version.toString();
+  let pos = 0;
+  let num = 0;
+  while ((pos = version.indexOf(".", pos + 1)) > 0) {
+    num++;
+  }
+  return version + ".0".repeat(2 - num);
+}
+function isUnreleasedVersion(version, env) {
+  const unreleasedLabel = _targets.unreleasedLabels[env];
+  return !!unreleasedLabel && unreleasedLabel === version.toString().toLowerCase();
+}
+function getLowestUnreleased(a, b, env) {
+  const unreleasedLabel = _targets.unreleasedLabels[env];
+  if (a === unreleasedLabel) {
+    return b;
+  }
+  if (b === unreleasedLabel) {
+    return a;
+  }
+  return semverMin(a, b);
+}
+function getHighestUnreleased(a, b, env) {
+  return getLowestUnreleased(a, b, env) === a ? b : a;
+}
+function getLowestImplementedVersion(plugin, environment) {
+  const result = plugin[environment];
+  if (!result && environment === "android") {
+    return plugin.chrome;
+  }
+  return result;
+}
+
+//# sourceMappingURL=utils.js.map