[FIX] mail: show attachment "uploading..." in chat window

When uploading an attachment from a chat window, the label
"Uploading..." was not visible. This comes from attachment preview
being too small, thus cutting entirely the filename and the upload
progress bar.

This commit fixes the issue by increasing the size of attachment
previews in chat window, so that it takes 50% width. It also provides
more space for labels on attachment preview while uploading, by
removing the right padding for the animated "unlink" feature that
works only for uploaded attachments anyway.

Note that this commit does not entirely solve the issue: half the
width of a chat window being enough to display the icon, the file
extension, and sometimes the label "Uploading..." completely. The
width of the icon and text extension combined is always the same,
but the label "Uploading..." changes with the locale. The extra space
from the padding removal makes this label fully visible in English,
but not necessarily in other languages. The proper fix requires
re-designing the style of attachment preview, which will be done in
master.

Task-Id: 1978640

closes odoo/odoo#33638

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>


Co-authored-by: Mohammed Shekha <msh@odoo.com>

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