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/escape.js

@@ -0,0 +1,30 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.escape = void 0;
+/**
+ * Escape all magic characters in a glob pattern.
+ *
+ * If the {@link MinimatchOptions.windowsPathsNoEscape}
+ * option is used, then characters are escaped by wrapping in `[]`, because
+ * a magic character wrapped in a character class can only be satisfied by
+ * that exact character.  In this mode, `\` is _not_ escaped, because it is
+ * not interpreted as a magic character, but instead as a path separator.
+ *
+ * If the {@link MinimatchOptions.magicalBraces} option is used,
+ * then braces (`{` and `}`) will be escaped.
+ */
+const escape = (s, { windowsPathsNoEscape = false, magicalBraces = false, } = {}) => {
+    // don't need to escape +@! because we escape the parens
+    // that make those magic, and escaping ! as [!] isn't valid,
+    // because [!]] is a valid glob class meaning not ']'.
+    if (magicalBraces) {
+        return windowsPathsNoEscape ?
+            s.replace(/[?*()[\]{}]/g, '[$&]')
+            : s.replace(/[?*()[\]\\{}]/g, '\\$&');
+    }
+    return windowsPathsNoEscape ?
+        s.replace(/[?*()[\]]/g, '[$&]')
+        : s.replace(/[?*()[\]\\]/g, '\\$&');
+};
+exports.escape = escape;
+//# sourceMappingURL=escape.js.map