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/vocabularies/dynamic/dynamicAnchor.js

@@ -0,0 +1,30 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.dynamicAnchor = void 0;
+const codegen_1 = require("../../compile/codegen");
+const names_1 = require("../../compile/names");
+const compile_1 = require("../../compile");
+const ref_1 = require("../core/ref");
+const def = {
+    keyword: "$dynamicAnchor",
+    schemaType: "string",
+    code: (cxt) => dynamicAnchor(cxt, cxt.schema),
+};
+function dynamicAnchor(cxt, anchor) {
+    const { gen, it } = cxt;
+    it.schemaEnv.root.dynamicAnchors[anchor] = true;
+    const v = (0, codegen_1._) `${names_1.default.dynamicAnchors}${(0, codegen_1.getProperty)(anchor)}`;
+    const validate = it.errSchemaPath === "#" ? it.validateName : _getValidate(cxt);
+    gen.if((0, codegen_1._) `!${v}`, () => gen.assign(v, validate));
+}
+exports.dynamicAnchor = dynamicAnchor;
+function _getValidate(cxt) {
+    const { schemaEnv, schema, self } = cxt.it;
+    const { root, baseId, localRefs, meta } = schemaEnv.root;
+    const { schemaId } = self.opts;
+    const sch = new compile_1.SchemaEnv({ schema, schemaId, root, baseId, localRefs, meta });
+    compile_1.compileSchema.call(self, sch);
+    return (0, ref_1.getValidate)(cxt, sch);
+}
+exports.default = def;
+//# sourceMappingURL=dynamicAnchor.js.map