- Each input now has a sibling .email-field-prefix span (To / Cc /
Bcc / Subject) absolute-positioned at the left edge in the
accent color. Inputs get padding-left:44px (64px for Subject)
so typed text doesn't slide under the prefix.
- Placeholders shrink back to just the example so only the
prefix gets the accent color, not the example text.
- Cc toggle moved another 2px up (calc(50% + 4px) → calc(50% + 2px)).
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