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-node/dist/hmr.d.ts

@@ -0,0 +1,54 @@
+import { HMRPayload, Plugin } from 'vite';
+import { EventEmitter } from 'node:events';
+import { C as CustomEventMap, a as ViteNodeRunner, H as HMRPayload$1, b as HotContext } from './index-z0R8hVRu.js';
+import './trace-mapping.d-DLVdEqOp.js';
+
+type EventType = string | symbol;
+type Handler<T = unknown> = (event: T) => void;
+interface Emitter<Events extends Record<EventType, unknown>> {
+    on: <Key extends keyof Events>(type: Key, handler: Handler<Events[Key]>) => void;
+    off: <Key extends keyof Events>(type: Key, handler?: Handler<Events[Key]>) => void;
+    emit: (<Key extends keyof Events>(type: Key, event: Events[Key]) => void) & (<Key extends keyof Events>(type: undefined extends Events[Key] ? Key : never) => void);
+}
+type HMREmitter = Emitter<{
+    message: HMRPayload;
+}> & EventEmitter;
+declare module 'vite' {
+    interface ViteDevServer {
+        emitter: HMREmitter;
+    }
+}
+declare function createHmrEmitter(): HMREmitter;
+declare function viteNodeHmrPlugin(): Plugin;
+
+type ModuleNamespace = Record<string, any> & {
+    [Symbol.toStringTag]: 'Module';
+};
+type InferCustomEventPayload<T extends string> = T extends keyof CustomEventMap ? CustomEventMap[T] : any;
+interface HotModule {
+    id: string;
+    callbacks: HotCallback[];
+}
+interface HotCallback {
+    deps: string[];
+    fn: (modules: (ModuleNamespace | undefined)[]) => void;
+}
+interface CacheData {
+    hotModulesMap: Map<string, HotModule>;
+    dataMap: Map<string, any>;
+    disposeMap: Map<string, (data: any) => void | Promise<void>>;
+    pruneMap: Map<string, (data: any) => void | Promise<void>>;
+    customListenersMap: Map<string, ((data: any) => void)[]>;
+    ctxToListenersMap: Map<string, Map<string, ((data: any) => void)[]>>;
+    messageBuffer: string[];
+    isFirstUpdate: boolean;
+    pending: boolean;
+    queued: Promise<(() => void) | undefined>[];
+}
+declare function getCache(runner: ViteNodeRunner): CacheData;
+declare function sendMessageBuffer(runner: ViteNodeRunner, emitter: HMREmitter): void;
+declare function reload(runner: ViteNodeRunner, files: string[]): Promise<any[]>;
+declare function handleMessage(runner: ViteNodeRunner, emitter: HMREmitter, files: string[], payload: HMRPayload$1): Promise<void>;
+declare function createHotContext(runner: ViteNodeRunner, emitter: HMREmitter, files: string[], ownerPath: string): HotContext;
+
+export { type Emitter, type EventType, type HMREmitter, type Handler, type HotCallback, type HotModule, type InferCustomEventPayload, type ModuleNamespace, createHmrEmitter, createHotContext, getCache, handleMessage, reload, sendMessageBuffer, viteNodeHmrPlugin };