Fix: auto-save grid size changes and dynamically scale grid item heights based on grid size

frontend/src/components/FileExplorer.tsx

@@ -2098,7 +2098,7 @@ export default function FileExplorer({ onLogout }: FileExplorerProps) {
                         <Pin className="absolute top-2 right-2 w-3 h-3" style={{ color: 'var(--color-warning)' }} />
                       )}
                       <div className="flex flex-col items-center gap-3">
-                        <div className="w-full h-32 flex items-center justify-center">
+                        <div className="w-full flex items-center justify-center" style={{ height: `calc(${gridSize}px * 0.65)` }}>
                           {getFileIcon(file, true)}
                         </div>
                         {renaming === file.path ? (