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/smob/dist/utils/array.d.ts

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+export declare function distinctArray<T = any>(arr: T[]): T[];

pwa/node_modules/smob/dist/utils/check.d.ts

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+export declare function isObject(item: unknown): item is Record<string, any>;
+export declare function isSafeKey(key: string): boolean;
+export declare function isEqual(x: any, y: any): boolean;

pwa/node_modules/smob/dist/utils/clone.d.ts

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+export declare function polyfillClone<T>(input: T): T;
+export declare function clone<T>(value: T): T;

pwa/node_modules/smob/dist/utils/index.d.ts

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+export * from './array';
+export * from './check';
+export * from './clone';
+export * from './object';
+export * from './options';

pwa/node_modules/smob/dist/utils/object.d.ts

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+export declare function hasOwnProperty<X extends {}, Y extends PropertyKey>(obj: X, prop: Y): obj is X & Record<Y, unknown>;

pwa/node_modules/smob/dist/utils/options.d.ts

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+import { PriorityName } from '../constants';
+import type { Options, OptionsInput } from '../type';
+export declare function buildOptions(options?: OptionsInput): Options;
+export declare function togglePriority(priority: `${PriorityName}`): "left" | "right";