Fix Summary.tscn vertical separator: stretch_mode 2 -> 1

In Godot 3 the TextureRect stretch_mode enum included a deprecated
"Scale on Expand" at value 0, so Tile=2. Godot 4 dropped that value
and shifted everything down: Tile is now 1. The convert-3to4 tool
does not remap enum values, so the separator at the right edge of
the menu kept Godot 3's Tile=2, which Godot 4 reads as Keep — the
texture rendered once at natural size at the top instead of tiling
down the full menu height.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scenes/UI/summary/Summary.tscn

@@ -380,7 +380,7 @@ clip_contents = true
 size_flags_horizontal = 11
 size_flags_vertical = 3
 texture = ExtResource( 8 )
-stretch_mode = 2
+stretch_mode = 1
 __meta__ = {
 "_edit_use_anchors_": false
 }