fix: enable scrolling in settings page on Windows (#1780)

Fixes #1743

The settings page was unable to scroll because .config-layout has
overflow:hidden which blocks child scrolling. Added min-height:0 and
overflow-y:auto to .config-main to enable scrolling within the grid
layout.

ui/src/styles/config.css

@@ -242,8 +242,10 @@
 .config-main {
   display: flex;
   flex-direction: column;
+  min-height: 0;
   min-width: 0;
   background: var(--panel);
+  overflow-y: auto;
 }
 
 /* Actions Bar */