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/@isaacs/cliui/dist/commonjs/index.d.ts

@@ -0,0 +1,41 @@
+export type UIOptions = {
+    width: number;
+    wrap?: boolean;
+    rows?: string[];
+};
+export type Column = {
+    text: string;
+    width?: number;
+    align?: 'right' | 'left' | 'center';
+    padding?: number[];
+    border?: boolean;
+};
+export type ColumnArray = Column[] & {
+    span?: boolean;
+};
+export type Line = {
+    hidden?: boolean;
+    text: string;
+    span?: boolean;
+};
+export declare class UI {
+    width: number;
+    wrap: boolean;
+    rows: ColumnArray[];
+    constructor(opts: UIOptions);
+    span(...args: ColumnArray): void;
+    resetOutput(): void;
+    div(...args: (Column | string)[]): ColumnArray;
+    shouldApplyLayoutDSL(...args: (Column | string)[]): boolean;
+    applyLayoutDSL(str: string): ColumnArray;
+    colFromString(text: string): Column;
+    measurePadding(str: string): number[];
+    toString(): string;
+    rowToString(row: ColumnArray, lines: Line[]): Line[];
+    renderInline(source: string, previousLine: Line): string;
+    rasterize(row: ColumnArray): string[][];
+    negatePadding(col: Column): number;
+    columnWidths(row: ColumnArray): number[];
+}
+export declare const cliui: (opts?: Partial<UIOptions>) => UI;
+//# sourceMappingURL=index.d.ts.map