fix(candy-survival): implement stagger (knockdown), lunge visual bump, and target stealing/backfire animations for Knock (Q)

scripts/managers/candy_survival_manager.gd

@@ -395,11 +395,21 @@ func try_knock(attacker: int, target: int) -> bool:
 	var target_colors = player_candy_colors.get(target, [])
 	var target_candies = target_colors.size()
 
+	var attacker_node = main_scene.get_node_or_null(str(attacker))
+	var target_node = main_scene.get_node_or_null(str(target))
+	
+	if attacker_node and target_node:
+		attacker_node.rpc("sync_bump", target_node.current_position)
+
 	if target_candies == 0:
 		# Backfire: both lose a charge
 		player_knocks[attacker] = player_knocks.get(attacker, 0) - 1
 		rpc("sync_knock_charge_count", attacker, player_knocks[attacker])
-		# Attacker is also knocked down briefly (visual handled by caller)
+		
+		# Attacker is also knocked down briefly (backfire)
+		if attacker_node:
+			attacker_node.rpc("apply_stagger", 2.0)
+			
 		rpc("sync_knock_result", attacker, target, 0)
 		return false
 
@@ -416,6 +426,10 @@ func try_knock(attacker: int, target: int) -> bool:
 	rpc("sync_knock_charge_count", attacker, player_knocks[attacker])
 	player_last_knocked_by[target] = attacker
 
+	# Target is knocked down / staggered on successful knock
+	if target_node:
+		target_node.rpc("apply_stagger", 2.0)
+
 	_add_score(attacker, target_candies * 100)
 	_update_candy_badge(attacker)
 	_update_candy_badge(target)