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/tinyrainbow/dist/index-c1cfc5e9.d.ts

@@ -0,0 +1,61 @@
+declare const colorsMap: {
+    readonly reset: readonly [0, 0];
+    readonly bold: readonly [1, 22, "\u001B[22m\u001B[1m"];
+    readonly dim: readonly [2, 22, "\u001B[22m\u001B[2m"];
+    readonly italic: readonly [3, 23];
+    readonly underline: readonly [4, 24];
+    readonly inverse: readonly [7, 27];
+    readonly hidden: readonly [8, 28];
+    readonly strikethrough: readonly [9, 29];
+    readonly black: readonly [30, 39];
+    readonly red: readonly [31, 39];
+    readonly green: readonly [32, 39];
+    readonly yellow: readonly [33, 39];
+    readonly blue: readonly [34, 39];
+    readonly magenta: readonly [35, 39];
+    readonly cyan: readonly [36, 39];
+    readonly white: readonly [37, 39];
+    readonly gray: readonly [90, 39];
+    readonly bgBlack: readonly [40, 49];
+    readonly bgRed: readonly [41, 49];
+    readonly bgGreen: readonly [42, 49];
+    readonly bgYellow: readonly [43, 49];
+    readonly bgBlue: readonly [44, 49];
+    readonly bgMagenta: readonly [45, 49];
+    readonly bgCyan: readonly [46, 49];
+    readonly bgWhite: readonly [47, 49];
+    readonly blackBright: readonly [90, 39];
+    readonly redBright: readonly [91, 39];
+    readonly greenBright: readonly [92, 39];
+    readonly yellowBright: readonly [93, 39];
+    readonly blueBright: readonly [94, 39];
+    readonly magentaBright: readonly [95, 39];
+    readonly cyanBright: readonly [96, 39];
+    readonly whiteBright: readonly [97, 39];
+    readonly bgBlackBright: readonly [100, 49];
+    readonly bgRedBright: readonly [101, 49];
+    readonly bgGreenBright: readonly [102, 49];
+    readonly bgYellowBright: readonly [103, 49];
+    readonly bgBlueBright: readonly [104, 49];
+    readonly bgMagentaBright: readonly [105, 49];
+    readonly bgCyanBright: readonly [106, 49];
+    readonly bgWhiteBright: readonly [107, 49];
+};
+interface Formatter {
+    (input?: unknown): string;
+    open: string;
+    close: string;
+}
+type ColorName = keyof typeof colorsMap;
+type ColorsMethods = {
+    [Key in ColorName]: Formatter;
+};
+type Colors = ColorsMethods & {
+    isColorSupported: boolean;
+    reset: (input: unknown) => string;
+};
+declare function getDefaultColors(): Colors;
+declare function isSupported(isTTY?: boolean): boolean;
+declare function createColors(isTTY?: boolean): Colors;
+
+export { Colors as C, Formatter as F, createColors as c, getDefaultColors as g, isSupported as i };