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/@vitest/utils/dist/index.d.ts

@@ -0,0 +1,55 @@
+import { PrettyFormatOptions } from '@vitest/pretty-format';
+export { DeferPromise, assertTypes, clone, createDefer, createSimpleStackTrace, deepClone, deepMerge, getCallLastIndex, getOwnProperties, getType, isNegativeNaN, isObject, isPrimitive, noop, notNullish, objectAttr, parseRegexp, slash, toArray } from './helpers.js';
+import { Colors } from 'tinyrainbow';
+export { ArgumentsType, Arrayable, Awaitable, Constructable, DeepMerge, ErrorWithDiff, MergeInsertions, MutableArray, Nullable, ParsedStack, SerializedError, TestError } from './types.js';
+
+type Inspect = (value: unknown, options: Options) => string;
+interface Options {
+    showHidden: boolean;
+    depth: number;
+    colors: boolean;
+    customInspect: boolean;
+    showProxy: boolean;
+    maxArrayLength: number;
+    breakLength: number;
+    truncate: number;
+    seen: unknown[];
+    inspect: Inspect;
+    stylize: (value: string, styleType: string) => string;
+}
+type LoupeOptions = Partial<Options>;
+interface StringifyOptions extends PrettyFormatOptions {
+    maxLength?: number;
+}
+declare function stringify(object: unknown, maxDepth?: number, { maxLength, ...options }?: StringifyOptions): string;
+declare function format(...args: unknown[]): string;
+declare function inspect(obj: unknown, options?: LoupeOptions): string;
+declare function objDisplay(obj: unknown, options?: LoupeOptions): string;
+
+interface HighlightOptions {
+    jsx?: boolean;
+    colors?: Colors;
+}
+declare function highlight(code: string, options?: HighlightOptions): string;
+
+declare function nanoid(size?: number): string;
+
+declare const lineSplitRE: RegExp;
+declare function positionToOffset(source: string, lineNumber: number, columnNumber: number): number;
+declare function offsetToLineNumber(source: string, offset: number): number;
+
+declare function shuffle<T>(array: T[], seed?: number): T[];
+
+interface SafeTimers {
+    nextTick: (cb: () => void) => void;
+    setTimeout: typeof setTimeout;
+    setInterval: typeof setInterval;
+    clearInterval: typeof clearInterval;
+    clearTimeout: typeof clearTimeout;
+    setImmediate: typeof setImmediate;
+    clearImmediate: typeof clearImmediate;
+}
+declare function getSafeTimers(): SafeTimers;
+declare function setSafeTimers(): void;
+
+export { type SafeTimers, type StringifyOptions, format, getSafeTimers, highlight, inspect, lineSplitRE, nanoid, objDisplay, offsetToLineNumber, positionToOffset, setSafeTimers, shuffle, stringify };