Show expected vs actual pace/HR per lap in the Review Queue

Activities recorded from a structured Garmin workout carry a workoutId;
when its steps line up 1:1 with the recorded laps, the per-step target
pace/HR zone is resolved (via a Karvonen lookup for named zones) and stored
on each lap. The Review Queue plots it against the actual per-lap pace/HR
so the user can eyeball whether a run matches its plan while sorting it.

backend/internal/api/api_test.go

@@ -164,6 +164,12 @@ func TestReviewQueueResolve(t *testing.T) {
 	}); err != nil {
 		t.Fatalf("InsertKindAssignment: %v", err)
 	}
+	targetLow, targetHigh := 3.0, 3.5
+	if err := db.ReplaceLaps(ctx, activityID, []store.Lap{
+		{LapIndex: 1, TargetPaceLowMps: &targetLow, TargetPaceHighMps: &targetHigh},
+	}); err != nil {
+		t.Fatalf("ReplaceLaps: %v", err)
+	}
 
 	router := s.Router()
 	rec := doJSON(t, router, http.MethodGet, "/api/review-queue/", nil)
@@ -175,6 +181,10 @@ func TestReviewQueueResolve(t *testing.T) {
 	if len(queue) != 1 {
 		t.Fatalf("expected 1 item in review queue, got %d: %s", len(queue), rec.Body.String())
 	}
+	laps, _ := queue[0]["laps"].([]any)
+	if len(laps) != 1 {
+		t.Fatalf("expected 1 lap in review queue item, got %d: %s", len(laps), rec.Body.String())
+	}
 
 	rec = doJSON(t, router, http.MethodPost, "/api/review-queue/"+itoa(activityID)+"/resolve", map[string]any{"workout_kind_id": kindID})
 	if rec.Code != http.StatusOK {