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/compile/validate/subschema.d.ts

@@ -0,0 +1,47 @@
+import type { AnySchema } from "../../types";
+import type { SchemaObjCxt } from "..";
+import { Code, Name } from "../codegen";
+import { Type } from "../util";
+import type { JSONType } from "../rules";
+export interface SubschemaContext {
+    schema: AnySchema;
+    schemaPath: Code;
+    errSchemaPath: string;
+    topSchemaRef?: Code;
+    errorPath?: Code;
+    dataLevel?: number;
+    dataTypes?: JSONType[];
+    data?: Name;
+    parentData?: Name;
+    parentDataProperty?: Code | number;
+    dataNames?: Name[];
+    dataPathArr?: (Code | number)[];
+    propertyName?: Name;
+    jtdDiscriminator?: string;
+    jtdMetadata?: boolean;
+    compositeRule?: true;
+    createErrors?: boolean;
+    allErrors?: boolean;
+}
+export type SubschemaArgs = Partial<{
+    keyword: string;
+    schemaProp: string | number;
+    schema: AnySchema;
+    schemaPath: Code;
+    errSchemaPath: string;
+    topSchemaRef: Code;
+    data: Name | Code;
+    dataProp: Code | string | number;
+    dataTypes: JSONType[];
+    definedProperties: Set<string>;
+    propertyName: Name;
+    dataPropType: Type;
+    jtdDiscriminator: string;
+    jtdMetadata: boolean;
+    compositeRule: true;
+    createErrors: boolean;
+    allErrors: boolean;
+}>;
+export declare function getSubschema(it: SchemaObjCxt, { keyword, schemaProp, schema, schemaPath, errSchemaPath, topSchemaRef }: SubschemaArgs): SubschemaContext;
+export declare function extendSubschemaData(subschema: SubschemaContext, it: SchemaObjCxt, { dataProp, dataPropType: dpType, data, dataTypes, propertyName }: SubschemaArgs): void;
+export declare function extendSubschemaMode(subschema: SubschemaContext, { jtdDiscriminator, jtdMetadata, compositeRule, createErrors, allErrors }: SubschemaArgs): void;