Feature Request: Improve error message clarity for account-related issues

### Is your feature request related to a problem? Please describe.

The error messages provided by the Base Account SDK are not very clear when an issue occurs, leaving users confused about what went wrong or how to fix it.
When errors happen during account-related actions (like login or account creation), the messages shown are too vague or technical. This makes it difficult for users, especially those without a technical background, to understand the problem and what they can do to resolve it.

### Describe the solution you'd like

Update the error messages to be more user-friendly, with clear explanations and actionable suggestions for the user. The goal is to improve the overall user experience by making errors easier to understand.

The issue names no files, tests, or entry points. Start by locating the account-action error definitions and their tests, then identify which login and account-creation messages are vague. Done means the affected errors explain what went wrong in user-friendly language and include actionable guidance.

Written by the indexing model from the issue text.