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/jtd/index.js

@@ -0,0 +1,29 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const ref_1 = require("./ref");
+const type_1 = require("./type");
+const enum_1 = require("./enum");
+const elements_1 = require("./elements");
+const properties_1 = require("./properties");
+const optionalProperties_1 = require("./optionalProperties");
+const discriminator_1 = require("./discriminator");
+const values_1 = require("./values");
+const union_1 = require("./union");
+const metadata_1 = require("./metadata");
+const jtdVocabulary = [
+    "definitions",
+    ref_1.default,
+    type_1.default,
+    enum_1.default,
+    elements_1.default,
+    properties_1.default,
+    optionalProperties_1.default,
+    discriminator_1.default,
+    values_1.default,
+    union_1.default,
+    metadata_1.default,
+    { keyword: "additionalProperties", schemaType: "boolean" },
+    { keyword: "nullable", schemaType: "boolean" },
+];
+exports.default = jtdVocabulary;
+//# sourceMappingURL=index.js.map