fix: ensure grid item width large enough for title bar text and button

Author: KatoakDR

electron/renderer/components/grid/grid-item.tsx

@@ -153,6 +153,11 @@ export const GridItem: React.FC<GridItemProps> = forwardRef<
       style={style}
       className={className}
       {...otherProps}
+      css={{
+        // Prevent shrinking smaller than the title bar
+        // so that the title and close button are always visible.
+        minWidth: 'min-content',
+      }}
     >
       <EuiSplitPanel.Inner grow={false} color="subdued" paddingSize="none">
         <EuiFlexGroup