FEAT: Show DKIM/SPF/DMARC authentication results

[andrinoff]

Is your feature request related to a problem?

Authentication results aren't surfaced, so users can't gauge sender legitimacy.

Describe the solution you'd like

Parse Authentication-Results / Received-SPF headers and display a pass/fail summary in the message view.

Describe alternatives you've considered

Inspecting raw headers.

Additional context

Parse in view/; display in tui/email_view.go.

[floatpanebot]

Thanks for the suggestion!

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