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/applicator/index.d.ts

@@ -0,0 +1,13 @@
+import type { ErrorNoParams, Vocabulary } from "../../types";
+import { AdditionalItemsError } from "./additionalItems";
+import { ItemsError } from "./items2020";
+import { ContainsError } from "./contains";
+import { DependenciesError } from "./dependencies";
+import { PropertyNamesError } from "./propertyNames";
+import { AdditionalPropertiesError } from "./additionalProperties";
+import { NotKeywordError } from "./not";
+import { AnyOfError } from "./anyOf";
+import { OneOfError } from "./oneOf";
+import { IfKeywordError } from "./if";
+export default function getApplicator(draft2020?: boolean): Vocabulary;
+export type ApplicatorKeywordError = ErrorNoParams<"false schema"> | AdditionalItemsError | ItemsError | ContainsError | AdditionalPropertiesError | DependenciesError | IfKeywordError | AnyOfError | OneOfError | NotKeywordError | PropertyNamesError;