Skip password when creating a new address

[CassioMG]

Closes https://github.com/stellar/freighter/issues/923

This PR implements the following changes as discussed on the issue:

• In case the password is STILL saved in current session store users won't need to input their password when creating a new Stellar address. Instead, the application will automatically read it from the session state.
• In case the password is NOT saved (e.g. the session timed out) then it'll ask for the password.
  • ^ this PR has also changed a couple copies on this "Enter Password" screen:
    • Screen title update: "Add a new Stellar address" => "Enter Password"
    • Button title update: "Add New Address" => "Create New Address"

*Note: this PR is based on feature/maintain-password-2 branch since it relies on changes from this other PR.

Creating a new address when password is saved

https://github.com/user-attachments/assets/c7d6f33a-5899-4c3e-bc9e-535d5d5f4115

Creating a new address when password is NOT saved

https://github.com/user-attachments/assets/83436042-c4a3-4127-8a98-f056d1fd5ca7

Auth error while creating a new address

https://github.com/user-attachments/assets/3dc6caa4-fcc3-440b-96e9-0b28b7f60c9f

[CassioMG]

After the automatic base branch switch it appears this PR is showing more changes then it should have.

So closing this in favor of https://github.com/stellar/freighter/pull/1685 which contains only the changes related to this task.