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/@isaacs/cliui/dist/commonjs/ansi-regex/index.js

@@ -0,0 +1,16 @@
+"use strict";
+// TODO! cut this down? do we need the onlyFirst option?
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ansiRegex = void 0;
+const ansiRegex = ({ onlyFirst = false } = {}) => {
+    // Valid string terminator sequences are BEL, ESC\, and 0x9c
+    const ST = "(?:\\u0007|\\u001B\\u005C|\\u009C)";
+    // OSC sequences only: ESC ] ... ST (non-greedy until the first ST)
+    const osc = `(?:\\u001B\\][\\s\\S]*?${ST})`;
+    // CSI and related: ESC/C1, optional intermediates, optional params (supports ; and :) then final byte
+    const csi = "[\\u001B\\u009B][[\\]()#;?]*(?:\\d{1,4}(?:[;:]\\d{0,4})*)?[\\dA-PR-TZcf-nq-uy=><~]";
+    const pattern = `${osc}|${csi}`;
+    return new RegExp(pattern, onlyFirst ? undefined : "g");
+};
+exports.ansiRegex = ansiRegex;
+//# sourceMappingURL=index.js.map