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/minimatch/dist/commonjs/unescape.js

@@ -0,0 +1,38 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.unescape = void 0;
+/**
+ * Un-escape a string that has been escaped with {@link escape}.
+ *
+ * If the {@link MinimatchOptions.windowsPathsNoEscape} option is used, then
+ * square-bracket escapes are removed, but not backslash escapes.
+ *
+ * For example, it will turn the string `'[*]'` into `*`, but it will not
+ * turn `'\\*'` into `'*'`, because `\` is a path separator in
+ * `windowsPathsNoEscape` mode.
+ *
+ * When `windowsPathsNoEscape` is not set, then both square-bracket escapes and
+ * backslash escapes are removed.
+ *
+ * Slashes (and backslashes in `windowsPathsNoEscape` mode) cannot be escaped
+ * or unescaped.
+ *
+ * When `magicalBraces` is not set, escapes of braces (`{` and `}`) will not be
+ * unescaped.
+ */
+const unescape = (s, { windowsPathsNoEscape = false, magicalBraces = true, } = {}) => {
+    if (magicalBraces) {
+        return windowsPathsNoEscape ?
+            s.replace(/\[([^\/\\])\]/g, '$1')
+            : s
+                .replace(/((?!\\).|^)\[([^\/\\])\]/g, '$1$2')
+                .replace(/\\([^\/])/g, '$1');
+    }
+    return windowsPathsNoEscape ?
+        s.replace(/\[([^\/\\{}])\]/g, '$1')
+        : s
+            .replace(/((?!\\).|^)\[([^\/\\{}])\]/g, '$1$2')
+            .replace(/\\([^\/{}])/g, '$1');
+};
+exports.unescape = unescape;
+//# sourceMappingURL=unescape.js.map