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/applicator/allOf.ts

@@ -0,0 +1,22 @@
+import type {CodeKeywordDefinition, AnySchema} from "../../types"
+import type {KeywordCxt} from "../../compile/validate"
+import {alwaysValidSchema} from "../../compile/util"
+
+const def: CodeKeywordDefinition = {
+  keyword: "allOf",
+  schemaType: "array",
+  code(cxt: KeywordCxt) {
+    const {gen, schema, it} = cxt
+    /* istanbul ignore if */
+    if (!Array.isArray(schema)) throw new Error("ajv implementation error")
+    const valid = gen.name("valid")
+    schema.forEach((sch: AnySchema, i: number) => {
+      if (alwaysValidSchema(it, sch)) return
+      const schCxt = cxt.subschema({keyword: "allOf", schemaProp: i}, valid)
+      cxt.ok(valid)
+      cxt.mergeEvaluated(schCxt)
+    })
+  },
+}
+
+export default def