feat(candy-survival): toggle-and-walk knock mode, unified animations, score rewards, RPC fix

- Changed knock from instant-ambush to toggle-and-walk: press Q to toggle Knock Mode ON, walk into target to execute, consumed on use
- Unified knock animation with other game modes (attack_mode SFX, bump, 3-tile knockback, stagger)
- Added +100 score rewards for completing goals, KNOCK, and GHOST
- Fixed RPC unknown peer ID crash for AI bots in ghost/candy stack sync
- Bots auto-toggle is_charged_strike when they have knock charges
- Fixed profile panel username update on connected peers
- Added SafeNakamaMultiplayerBridge for match state crash prevention

scripts/managers/player_input_manager.gd

@@ -120,39 +120,28 @@ func handle_unhandled_input(event):
 				var gm = player.get_node_or_null("/root/Main/CandySurvivalManager")
 				if gm and gm.active:
 					var att_id = player.get("peer_id") if "peer_id" in player else player.name.to_int()
+					
+					# Toggle mode: if already in knock mode, turn it off
+					if player.get("is_charged_strike"):
+						player.is_charged_strike = false
+						NotificationManager.send_message(player, "Knock Mode OFF", NotificationManager.MessageType.WARNING)
+						get_viewport().set_input_as_handled()
+						return
+					
+					# Check charges before toggling on
 					if gm.player_knocks.get(att_id, 5) <= 0:
 						NotificationManager.send_message(player, "No Knock charges left!", NotificationManager.MessageType.WARNING)
 						get_viewport().set_input_as_handled()
 						return
-						
-					# Find a target to knock (adjacent player: cardinal or diagonal distance <= 1)
-					var p_pos = player.current_position
-					var all_players = get_tree().get_nodes_in_group("Players")
-					var target_found = null
-					var min_dist = 999
-					for other in all_players:
-						if other == player or not is_instance_valid(other): continue
-						var other_pos = other.current_position
-						var dist = max(abs(p_pos.x - other_pos.x), abs(p_pos.y - other_pos.y))
-						if dist <= 1 and dist < min_dist:
-							target_found = other
-							min_dist = dist
-							if dist == 1:
-								break
-							
-					if target_found:
-						var tgt_id = target_found.get("peer_id") if "peer_id" in target_found else target_found.name.to_int()
-						if multiplayer.is_server():
-							gm.try_knock(att_id, tgt_id)
-						else:
-							gm.rpc_id(1, "try_knock", att_id, tgt_id)
-					else:
-						# No target, but play the bump animation anyway in place
-						player.rpc("sync_bump", p_pos)
-						
+					
+					# Toggle knock mode ON (reuses charged strike visuals)
+					player.is_charged_strike = true
+					NotificationManager.send_message(player, "🥊 Knock Mode ON — Walk into a target!", NotificationManager.MessageType.POWERUP)
+					player.update_active_player_indicator()
+					
 					get_viewport().set_input_as_handled()
 					return
-							
+					
 			if player.powerup_manager:
 				player.powerup_manager.use_special_effect()
 				if player.get("is_attack_mode") and player.has_method("enter_attack_mode"):