Reach nodes by unique name instead of long paths

Nodes a script uses through a path of several nodes are marked unique in their
scene and found with %Name. The search list is renamed SearchResults, and the
player row's nodes get their real types.

qr_popup.gd

@@ -5,10 +5,10 @@ extends BasePopup
 var qr_panel: Panel = $QRPanel
 
 @onready
-var qr_code_rect: QRCodeRect = $QRPanel/QRCodeRect
+var qr_code_rect: QRCodeRect = %QRCodeRect
 
 @onready
-var url_label: Label = $QRPanel/URLLabel
+var url_label: Label = %URLLabel
 
 
 func _ready() -> void: