feat(frontend): add dashboard and race calendar views

Implement dashboard metrics and split race lists with BEM-styled cards using the typed races API.

Made-with: Cursor

frontend/src/lib/index.ts

@@ -1 +1,11 @@
-export {};
+export {
+  formatDistance,
+  formatRaceDate,
+  getPaceLabel,
+  getRaceCountdownLabel,
+  getRaceStatusLabel,
+  parseFinishTimeToSeconds,
+  sortByDateAsc,
+  sortByDateDesc,
+  splitRacesByDate,
+} from "./raceMetrics";