fix: add missing getPopularWorkouts export to data layer

The workout complete screen imports getPopularWorkouts to show
recommended workouts, but the function was never implemented. Added it
to the data index — picks the first workout from each program week for
variety across categories and levels.

src/shared/data/index.ts

@@ -73,6 +73,21 @@ export const CATEGORIES: { id: ProgramId | 'all'; label: string }[] = [
   { id: 'full-body', label: 'Full Body' },
 ]
 
+// ═══════════════════════════════════════════════════════════════════════════
+// POPULAR / RECOMMENDED
+// ═══════════════════════════════════════════════════════════════════════════
+
+/** Return a shuffled sample of workouts across all programs (one per program per week). */
+export function getPopularWorkouts(count: number = 4) {
+  // Pick the first workout from each program week to get variety
+  const picks = Object.values(PROGRAMS).flatMap((program) =>
+    program.weeks.map((week) => week.workouts[0]).filter(Boolean)
+  )
+  // Simple deterministic shuffle based on id to avoid re-renders
+  const sorted = [...picks].sort((a, b) => a.id.localeCompare(b.id))
+  return sorted.slice(0, count)
+}
+
 // Legacy exports for backward compatibility (to be removed)
 export { WORKOUTS } from './workouts'
 export { FEATURED_COLLECTION_ID } from './collections'