Previously only the From row affected the action cluster's column
width — To/Cc detail rows spanned both columns and ignored the
cluster. Now:
- meta-details lives in col 1 only so the To/Cc chips shrink
together with the From chip when the pane narrows
- action cluster spans rows 1 and 2 so its width is set by the
widest col-1 content; a long To/Cc list triggers the wrap to a
2-row icon stack just like a long From sender does
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