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/lib/vocabularies/jtd/index.ts

@@ -0,0 +1,37 @@
+import type {Vocabulary} from "../../types"
+import refKeyword from "./ref"
+import typeKeyword, {JTDTypeError} from "./type"
+import enumKeyword, {JTDEnumError} from "./enum"
+import elements, {JTDElementsError} from "./elements"
+import properties, {JTDPropertiesError} from "./properties"
+import optionalProperties from "./optionalProperties"
+import discriminator, {JTDDiscriminatorError} from "./discriminator"
+import values, {JTDValuesError} from "./values"
+import union from "./union"
+import metadata from "./metadata"
+
+const jtdVocabulary: Vocabulary = [
+  "definitions",
+  refKeyword,
+  typeKeyword,
+  enumKeyword,
+  elements,
+  properties,
+  optionalProperties,
+  discriminator,
+  values,
+  union,
+  metadata,
+  {keyword: "additionalProperties", schemaType: "boolean"},
+  {keyword: "nullable", schemaType: "boolean"},
+]
+
+export default jtdVocabulary
+
+export type JTDErrorObject =
+  | JTDTypeError
+  | JTDEnumError
+  | JTDElementsError
+  | JTDPropertiesError
+  | JTDDiscriminatorError
+  | JTDValuesError