FEAT: Flexible Layouts (Horizontal / Vertical)

[OverStyleFR]

Is your feature request related to a problem?

No

Describe the solution you'd like

Provide an option to switch between Horizontal and Vertical split-views (for the email list and the message display pane).

Describe alternatives you've considered

No response

Additional context

This addition would greatly improve workflow efficiency, especially for users migrating from other email clients like NeoMutt or Aerc (TUI mail client).

[floatpanebot]

Thanks for the suggestion!

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