How do I sign a transaction?

The examples are not very clear. How do I use the wallet to

1) prompt the user for password/acceptance, then
2) use password to decrypt passwordDerivedKey, and finally
3) sign transaction?

The keystore is great, I just need some help implementing this into a real wallet where a user is actually prompted for a password before signing the transaction, similar to how metamask prompts to accept/reject the transaction.

Review the existing examples and keystore usage to trace the documented flow from prompting for password acceptance through decrypting passwordDerivedKey and signing a transaction. Done means the examples clearly explain this real-wallet flow, including user acceptance or rejection, without leaving the signing steps ambiguous.

Written by the indexing model from the issue text.