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/validation/index.ts

@@ -0,0 +1,49 @@
+import type {ErrorObject, Vocabulary} from "../../types"
+import limitNumber, {LimitNumberError} from "./limitNumber"
+import multipleOf, {MultipleOfError} from "./multipleOf"
+import limitLength from "./limitLength"
+import pattern, {PatternError} from "./pattern"
+import limitProperties from "./limitProperties"
+import required, {RequiredError} from "./required"
+import limitItems from "./limitItems"
+import uniqueItems, {UniqueItemsError} from "./uniqueItems"
+import constKeyword, {ConstError} from "./const"
+import enumKeyword, {EnumError} from "./enum"
+
+const validation: Vocabulary = [
+  // number
+  limitNumber,
+  multipleOf,
+  // string
+  limitLength,
+  pattern,
+  // object
+  limitProperties,
+  required,
+  // array
+  limitItems,
+  uniqueItems,
+  // any
+  {keyword: "type", schemaType: ["string", "array"]},
+  {keyword: "nullable", schemaType: "boolean"},
+  constKeyword,
+  enumKeyword,
+]
+
+export default validation
+
+type LimitError = ErrorObject<
+  "maxItems" | "minItems" | "minProperties" | "maxProperties" | "minLength" | "maxLength",
+  {limit: number},
+  number | {$data: string}
+>
+
+export type ValidationKeywordError =
+  | LimitError
+  | LimitNumberError
+  | MultipleOfError
+  | PatternError
+  | RequiredError
+  | UniqueItemsError
+  | ConstError
+  | EnumError