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/ajv/dist/compile/rules.js

@@ -0,0 +1,26 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getRules = exports.isJSONType = void 0;
+const _jsonTypes = ["string", "number", "integer", "boolean", "null", "object", "array"];
+const jsonTypes = new Set(_jsonTypes);
+function isJSONType(x) {
+    return typeof x == "string" && jsonTypes.has(x);
+}
+exports.isJSONType = isJSONType;
+function getRules() {
+    const groups = {
+        number: { type: "number", rules: [] },
+        string: { type: "string", rules: [] },
+        array: { type: "array", rules: [] },
+        object: { type: "object", rules: [] },
+    };
+    return {
+        types: { ...groups, integer: true, boolean: true, null: true },
+        rules: [{ rules: [] }, groups.number, groups.string, groups.array, groups.object],
+        post: { rules: [] },
+        all: {},
+        keywords: {},
+    };
+}
+exports.getRules = getRules;
+//# sourceMappingURL=rules.js.map