Refactored IMAP object initialization and folder selection into a new `OpenAsync` helper method to reduce code duplication and improve maintainability.
- Replaced repetitive connection, authentication, and folder selection logic in multiple methods (`FetchEmailsAsync`, `FetchEmailUidsAsync`, etc.) with `OpenAsync`.
- Removed `ConnectAndAuthenticateAsync` and `SelectFolderAsync` methods, as their functionality is now encapsulated in `OpenAsync`.
- Updated `FetchEmailUidsAsync` to remove the `EmailAccountDto account` parameter, delegating connection logic to `OpenAsync`.
- Ensured all methods now use `OpenAsync` to obtain a fully prepared `Imap` instance, improving clarity and reducing error risk.
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