Change Pull Request button background to red

Updated the PR button background color from black to red (bg-red-600) as requested.

Co-authored-by: openhands <openhands@all-hands.dev>

frontend/src/components/features/controls/git-tools-submenu.tsx

@@ -84,7 +84,7 @@ export function GitToolsSubmenu({ onClose }: GitToolsSubmenuProps) {
       <ContextMenuListItem
         testId="create-pr-button"
         onClick={onCreatePR}
-        className={contextMenuListItemClassName}
+        className={`${contextMenuListItemClassName} bg-red-600 hover:bg-red-600`}
       >
         <ToolsContextMenuIconText
           icon={<PrIcon width={16} height={16} />}