Strengthen search breadth and modal fitting

backend/services/gemini_test.go

@@ -123,8 +123,8 @@ func TestRemainingGeminiCapacityShrinksWithReviewedItems(t *testing.T) {
 		{Link: "https://a.example"},
 		{Link: "https://b.example"},
 	}
-	if got := RemainingGeminiCapacity(reviewed); got != 14 {
-		t.Fatalf("expected 14 remaining slots, got %d", got)
+	if got := RemainingGeminiCapacity(reviewed); got != 22 {
+		t.Fatalf("expected 22 remaining slots, got %d", got)
 	}
 }