[fix] Email addr missing in fwded msgs / increase timeout for large msgs

Email addresses (From, To, Cc) of a forwarded message are lost and only the name is displayed.

Also, if forwarding a message with quite large attachments (but it happened to me with a 5Mb only attachment), the message send 'timed out' and can't send it using webmail.
>May be a consistent larger timeout is needed.

A sending icon should also be added, to appear when i press the send button, to let the user know about the started sending process and avoid interruption or multiple presses.

Start by tracing the forwarded-message rendering and send flow in the webmail client; the payload does not name files or tests. Confirm where From, To, and Cc addresses are lost, reproduce sending a message with a large attachment, and inspect the send-button state. Done means forwarded addresses remain visible, large messages complete reliably, and sending shows clear progress without duplicate submissions.

Written by the indexing model from the issue text.