Make arrow visibility more visible
Make the arrow more visible. Give me options

Outcome
Board creator→assignee arrow is now a heavy ➜ at 11px in the secondary tone (operator's pick of 4 options). Quick gate and 1765 task tests green; the visual check shows it clearly visible with no clipping. PR #7728 is queued to the lane. Memory: used mem-34684, mem-31277.
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