$ctx->{-title_html} = ascii_html($mime->header('Subject'));
$ctx->{-html_tip} = thread_index_entry($ctx, $level, $mime);
PublicInbox::WwwStream->response($ctx, 200, sub {
$ctx->{-title_html} = ascii_html($mime->header('Subject'));
$ctx->{-html_tip} = thread_index_entry($ctx, $level, $mime);
PublicInbox::WwwStream->response($ctx, 200, sub {