如图,菱形\(ABCD\)的对角线\(AC\)与\(BD\)交于点\(O\),点\(E\)、\(F\)分别在\(AD\),\(CD\)上,\(AE=CF\),\(EF\)交\(BD\)于点\(H\),将\(\triangle DEF\)沿\(EF\)折到\(\triangle D{{'}}EF \)的位置.
\((I)\)证明:\(AC⊥HD{{'}} \) ; \((II)\)若\(AB=5\),\(AC=6\),\(AE= \dfrac{5}{4},AD{{'}}=2 \sqrt{2} \),求五棱锥\(D{{'}}-ABCEF \)体积.