Config: Clamp the touch layout snap grid size on load

The layout editor divides by it, and drawing the grid never finishes when
it's 0. Only the slider limited it, so a hand-edited ini could hang.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Core/Config.cpp

@@ -1666,6 +1666,9 @@ void Config::PostLoadCleanup() {
 
 	// Three frames in flight showed no benefit over two, so the option is gone. Squash old values.
 	iInflightFrames = std::clamp(iInflightFrames, 1, 2);
+
+	// The touch layout editor divides by this, and loops forever drawing the grid if it's 0.
+	iTouchSnapGridSize = std::clamp(iTouchSnapGridSize, 2, 256);
 }
 
 void Config::PreSaveCleanup() {