Visual Distinction Between Key Poses and In-Between Keys

🔍 Problem
All Keys share the same color (black), so once there are many keys it is hard to tell key poses from polishing in-betweens.

💡 Requested feature
Visually distinguish All Keys from non–All Keys (color or other markers) so polishing is easier to read.

🎯 Expected benefit
Faster key cleanup/polishing and fewer accidental edits to important keys