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/vite/dist/node/runtime.d.ts

@@ -0,0 +1,63 @@
+import { V as ViteRuntimeOptions, b as ViteModuleRunner, M as ModuleCacheMap, c as HMRClient, R as ResolvedResult, d as ViteRuntimeModuleContext } from './types.d-aGj9QkWt.js';
+export { a as FetchFunction, F as FetchResult, e as HMRConnection, H as HMRLogger, g as HMRRuntimeConnection, f as ModuleCache, S as SSRImportMetadata, h as ViteRuntimeImportMeta, s as ssrDynamicImportKey, i as ssrExportAllKey, j as ssrImportKey, k as ssrImportMetaKey, l as ssrModuleExportsKey } from './types.d-aGj9QkWt.js';
+import '../../types/hot.js';
+import '../../types/hmrPayload.js';
+import '../../types/customEvent.js';
+
+interface ViteRuntimeDebugger {
+    (formatter: unknown, ...args: unknown[]): void;
+}
+declare class ViteRuntime {
+    options: ViteRuntimeOptions;
+    runner: ViteModuleRunner;
+    private debug?;
+    /**
+     * Holds the cache of modules
+     * Keys of the map are ids
+     */
+    moduleCache: ModuleCacheMap;
+    hmrClient?: HMRClient;
+    entrypoints: Set<string>;
+    private idToUrlMap;
+    private fileToIdMap;
+    private envProxy;
+    private _destroyed;
+    private _resetSourceMapSupport?;
+    constructor(options: ViteRuntimeOptions, runner: ViteModuleRunner, debug?: ViteRuntimeDebugger | undefined);
+    /**
+     * URL to execute. Accepts file path, server path or id relative to the root.
+     */
+    executeUrl<T = any>(url: string): Promise<T>;
+    /**
+     * Entrypoint URL to execute. Accepts file path, server path or id relative to the root.
+     * In the case of a full reload triggered by HMR, this is the module that will be reloaded.
+     * If this method is called multiple times, all entrypoints will be reloaded one at a time.
+     */
+    executeEntrypoint<T = any>(url: string): Promise<T>;
+    /**
+     * Clear all caches including HMR listeners.
+     */
+    clearCache(): void;
+    /**
+     * Clears all caches, removes all HMR listeners, and resets source map support.
+     * This method doesn't stop the HMR connection.
+     */
+    destroy(): Promise<void>;
+    /**
+     * Returns `true` if the runtime has been destroyed by calling `destroy()` method.
+     */
+    isDestroyed(): boolean;
+    private invalidateFiles;
+    private normalizeEntryUrl;
+    private processImport;
+    private cachedRequest;
+    private cachedModule;
+    protected directRequest(id: string, fetchResult: ResolvedResult, _callstack: string[]): Promise<any>;
+}
+
+declare class ESModulesRunner implements ViteModuleRunner {
+    runViteModule(context: ViteRuntimeModuleContext, code: string): Promise<any>;
+    runExternalModule(filepath: string): Promise<any>;
+}
+
+export { ESModulesRunner, ModuleCacheMap, ResolvedResult, ViteModuleRunner, ViteRuntime, ViteRuntimeModuleContext, ViteRuntimeOptions };