fix: toggle settings shortcut fix

src/routes/(app)/+layout.svelte

@@ -160,8 +160,8 @@
 					document.getElementById('delete-chat-button')?.click();
 				}
 
-				// Check if Ctrl + S is pressed
-				if (isCtrlPressed && event.key.toLowerCase() === 's') {
+				// Check if Ctrl + . is pressed
+				if (isCtrlPressed && event.key === '.') {
 					event.preventDefault();
 					console.log('openSettings');
 					document.getElementById('open-settings-button')?.click();