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/jtd.d.ts

@@ -0,0 +1,47 @@
+import type { AnySchemaObject, SchemaObject, JTDParser } from "./types";
+import type { JTDSchemaType, SomeJTDSchemaType, JTDDataType } from "./types/jtd-schema";
+import AjvCore, { CurrentOptions } from "./core";
+type JTDOptions = CurrentOptions & {
+    strict?: never;
+    allowMatchingProperties?: never;
+    allowUnionTypes?: never;
+    validateFormats?: never;
+    $data?: never;
+    verbose?: boolean;
+    $comment?: never;
+    formats?: never;
+    loadSchema?: never;
+    useDefaults?: never;
+    coerceTypes?: never;
+    next?: never;
+    unevaluated?: never;
+    dynamicRef?: never;
+    meta?: boolean;
+    defaultMeta?: never;
+    inlineRefs?: boolean;
+    loopRequired?: never;
+    multipleOfPrecision?: never;
+};
+export declare class Ajv extends AjvCore {
+    constructor(opts?: JTDOptions);
+    _addVocabularies(): void;
+    _addDefaultMetaSchema(): void;
+    defaultMeta(): string | AnySchemaObject | undefined;
+    compileSerializer<T = unknown>(schema: SchemaObject): (data: T) => string;
+    compileSerializer<T = unknown>(schema: JTDSchemaType<T>): (data: T) => string;
+    compileParser<T = unknown>(schema: SchemaObject): JTDParser<T>;
+    compileParser<T = unknown>(schema: JTDSchemaType<T>): JTDParser<T>;
+    private _compileSerializer;
+    private _compileParser;
+}
+export default Ajv;
+export { Format, FormatDefinition, AsyncFormatDefinition, KeywordDefinition, KeywordErrorDefinition, CodeKeywordDefinition, MacroKeywordDefinition, FuncKeywordDefinition, Vocabulary, Schema, SchemaObject, AnySchemaObject, AsyncSchema, AnySchema, ValidateFunction, AsyncValidateFunction, ErrorObject, ErrorNoParams, JTDParser, } from "./types";
+export { Plugin, Options, CodeOptions, InstanceOptions, Logger, ErrorsTextOptions } from "./core";
+export { SchemaCxt, SchemaObjCxt } from "./compile";
+export { KeywordCxt } from "./compile/validate";
+export { JTDErrorObject } from "./vocabularies/jtd";
+export { _, str, stringify, nil, Name, Code, CodeGen, CodeGenOptions } from "./compile/codegen";
+export { JTDSchemaType, SomeJTDSchemaType, JTDDataType };
+export { JTDOptions };
+export { default as ValidationError } from "./runtime/validation_error";
+export { default as MissingRefError } from "./compile/ref_error";