fix(custom-buffer-file): stop leaking the MIME handle in the email viewerHEADmain

cj/view-email-in-buffer dissected the message into a handle, then signaled a user-error when it found no displayable part, before the mm-destroy-parts cleanup. The handle leaked on every image-only or attachment-only email. Wrap the body in unwind-protect so the handle is always destroyed.

While here, the eager top-level require of mm-decode only fed the mm-handle-type macro at compile time. The viewer already requires mm-decode at runtime before any mm-* call, so I moved it to eval-when-compile plus declare-function (matching the ps-print block above). Opening Emacs no longer loads mm-decode unless you view an email.

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