feat(player): animate authoritative hedge breakthroughs

docs/PLAYER_UI.md

@@ -59,9 +59,13 @@ a maze boundary, and is recalculated on resize and rotation.
 The browser stores the direction for each outstanding move request. A matching
 server `blocked` rejection may include only that player's approved breakthrough
 stage, which bends the already rendered bush wall for at most 340 ms without
-blocked-move text. Opened-passage bits in an ordinary cell projection render as
-a permanent trampled bush gap. Effects have one restartable timer and clear on
-pause, result, reset, disconnect, and control reset. Reduced motion is static.
+blocked-move text. A received opened-passage projection paired with an adjacent
+authoritative player move may show one 480 ms hedge-parting dash and four
+bounded decorative accents before settling at the server-approved destination.
+Opened-passage bits render a permanent trampled bush gap with a 60% clear
+centre. Effects have restartable timers and clear on a newer projection, pause,
+result, reset, disconnect, screen change, and control reset. Reduced motion is
+static and settles directly at the received destination.
 
 The map draws only a bounded canonical hedge-edge layer generated from current
 received cells. It hashes each visible edge deterministically to choose the