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/properties.ts

@@ -0,0 +1,57 @@
+import type {CodeKeywordDefinition} from "../../types"
+import {KeywordCxt} from "../../compile/validate"
+import {propertyInData, allSchemaProperties} from "../code"
+import {alwaysValidSchema, toHash, mergeEvaluated} from "../../compile/util"
+import apDef from "./additionalProperties"
+
+const def: CodeKeywordDefinition = {
+  keyword: "properties",
+  type: "object",
+  schemaType: "object",
+  code(cxt: KeywordCxt) {
+    const {gen, schema, parentSchema, data, it} = cxt
+    if (it.opts.removeAdditional === "all" && parentSchema.additionalProperties === undefined) {
+      apDef.code(new KeywordCxt(it, apDef, "additionalProperties"))
+    }
+    const allProps = allSchemaProperties(schema)
+    for (const prop of allProps) {
+      it.definedProperties.add(prop)
+    }
+    if (it.opts.unevaluated && allProps.length && it.props !== true) {
+      it.props = mergeEvaluated.props(gen, toHash(allProps), it.props)
+    }
+    const properties = allProps.filter((p) => !alwaysValidSchema(it, schema[p]))
+    if (properties.length === 0) return
+    const valid = gen.name("valid")
+
+    for (const prop of properties) {
+      if (hasDefault(prop)) {
+        applyPropertySchema(prop)
+      } else {
+        gen.if(propertyInData(gen, data, prop, it.opts.ownProperties))
+        applyPropertySchema(prop)
+        if (!it.allErrors) gen.else().var(valid, true)
+        gen.endIf()
+      }
+      cxt.it.definedProperties.add(prop)
+      cxt.ok(valid)
+    }
+
+    function hasDefault(prop: string): boolean | undefined {
+      return it.opts.useDefaults && !it.compositeRule && schema[prop].default !== undefined
+    }
+
+    function applyPropertySchema(prop: string): void {
+      cxt.subschema(
+        {
+          keyword: "properties",
+          schemaProp: prop,
+          dataProp: prop,
+        },
+        valid
+      )
+    }
+  },
+}
+
+export default def