Preserve original filename and content type on attachment download

Ya: 9 Mei 2026, 18:35 UTC
Mwandishi: Kamo
Ahadi ya: c783fde

The **************** endpoints (both the personal and shared-mailbox controllers) were emitting Content-Disposition: attachment with no filename parameter and Content-Type: application/octet-stream, forcing the browser to fall back to the URL's trailing index segment for the saved filename — files saved as "0", "1", etc. with no extension. Look up the matching AttachmentInfo via getMessage() and build a proper ContentDisposition with UTF-8 filename plus the real content type, falling back to the previous behavior when metadata lookup fails.

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