fix: Hidden native value in EIP-7002/EIP-7251 staking plugin review

Both staking plugins set uiType=ETH_UI_TYPE_GENERIC, which suppresses
the standard Amount/To pair. The review then displayed only the
withdrawal-request amount or validator pubkeys parsed from calldata,
never the native tx.value carried by the transaction. A malicious dApp
could attach an arbitrary ETH/native amount to a staking-style request
and have the user authorize it without seeing the value on screen.

Add a "Tx value" review screen to both EIP-7002 and EIP-7251 plugins
whenever the transaction's native value is non-zero, and adjust the
screen index ? screen kind mapping so the existing validator/amount
screens remain in their expected order.

(cherry picked from commit b1d360a8e2d93963bf315db43846e56236880b71)