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/@vitest/utils/dist/error.js

@@ -0,0 +1,137 @@
+import { printDiffOrStringify } from './diff.js';
+import { f as format, s as stringify } from './chunk-_commonjsHelpers.js';
+import '@vitest/pretty-format';
+import 'tinyrainbow';
+import './helpers.js';
+import 'loupe';
+
+const IS_RECORD_SYMBOL = "@@__IMMUTABLE_RECORD__@@";
+const IS_COLLECTION_SYMBOL = "@@__IMMUTABLE_ITERABLE__@@";
+function isImmutable(v) {
+  return v && (v[IS_COLLECTION_SYMBOL] || v[IS_RECORD_SYMBOL]);
+}
+const OBJECT_PROTO = Object.getPrototypeOf({});
+function getUnserializableMessage(err) {
+  if (err instanceof Error) {
+    return `<unserializable>: ${err.message}`;
+  }
+  if (typeof err === "string") {
+    return `<unserializable>: ${err}`;
+  }
+  return "<unserializable>";
+}
+function serializeValue(val, seen = /* @__PURE__ */ new WeakMap()) {
+  if (!val || typeof val === "string") {
+    return val;
+  }
+  if (typeof val === "function") {
+    return `Function<${val.name || "anonymous"}>`;
+  }
+  if (typeof val === "symbol") {
+    return val.toString();
+  }
+  if (typeof val !== "object") {
+    return val;
+  }
+  if (isImmutable(val)) {
+    return serializeValue(val.toJSON(), seen);
+  }
+  if (val instanceof Promise || val.constructor && val.constructor.prototype === "AsyncFunction") {
+    return "Promise";
+  }
+  if (typeof Element !== "undefined" && val instanceof Element) {
+    return val.tagName;
+  }
+  if (typeof val.asymmetricMatch === "function") {
+    return `${val.toString()} ${format(val.sample)}`;
+  }
+  if (typeof val.toJSON === "function") {
+    return serializeValue(val.toJSON(), seen);
+  }
+  if (seen.has(val)) {
+    return seen.get(val);
+  }
+  if (Array.isArray(val)) {
+    const clone = new Array(val.length);
+    seen.set(val, clone);
+    val.forEach((e, i) => {
+      try {
+        clone[i] = serializeValue(e, seen);
+      } catch (err) {
+        clone[i] = getUnserializableMessage(err);
+      }
+    });
+    return clone;
+  } else {
+    const clone = /* @__PURE__ */ Object.create(null);
+    seen.set(val, clone);
+    let obj = val;
+    while (obj && obj !== OBJECT_PROTO) {
+      Object.getOwnPropertyNames(obj).forEach((key) => {
+        if (key in clone) {
+          return;
+        }
+        try {
+          clone[key] = serializeValue(val[key], seen);
+        } catch (err) {
+          delete clone[key];
+          clone[key] = getUnserializableMessage(err);
+        }
+      });
+      obj = Object.getPrototypeOf(obj);
+    }
+    return clone;
+  }
+}
+function normalizeErrorMessage(message) {
+  return message.replace(/__(vite_ssr_import|vi_import)_\d+__\./g, "");
+}
+function processError(_err, diffOptions, seen = /* @__PURE__ */ new WeakSet()) {
+  if (!_err || typeof _err !== "object") {
+    return { message: String(_err) };
+  }
+  const err = _err;
+  if (err.stack) {
+    err.stackStr = String(err.stack);
+  }
+  if (err.name) {
+    err.nameStr = String(err.name);
+  }
+  if (err.showDiff || err.showDiff === void 0 && err.expected !== void 0 && err.actual !== void 0) {
+    err.diff = printDiffOrStringify(err.actual, err.expected, {
+      ...diffOptions,
+      ...err.diffOptions
+    });
+  }
+  if (typeof err.expected !== "string") {
+    err.expected = stringify(err.expected, 10);
+  }
+  if (typeof err.actual !== "string") {
+    err.actual = stringify(err.actual, 10);
+  }
+  try {
+    if (typeof err.message === "string") {
+      err.message = normalizeErrorMessage(err.message);
+    }
+  } catch {
+  }
+  try {
+    if (!seen.has(err) && typeof err.cause === "object") {
+      seen.add(err);
+      err.cause = processError(err.cause, diffOptions, seen);
+    }
+  } catch {
+  }
+  try {
+    return serializeValue(err);
+  } catch (e) {
+    return serializeValue(
+      new Error(
+        `Failed to fully serialize error: ${e == null ? void 0 : e.message}
+Inner error message: ${err == null ? void 0 : err.message}`
+      )
+    );
+  }
+}
+
+export { processError, serializeValue as serializeError, serializeValue };