Adds a per-field X (24x24 SVG, opacity 0.4 → 1 + accent on hover)
absolute-positioned at the right edge of each Cc/Bcc field. Click
hides both rows, clears their inputs, and restores the Cc opener
on the To row. Inputs get padding-right:32px so the close button
doesn't overlap typed text.
f538da9a8e