feat: disable Download button when no config is loaded

src/componets/FileChooser.tsx

@@ -60,6 +60,8 @@ export function FileChooser({ onSelected, config }: FileChooserProps) {
     URL.revokeObjectURL(url);
   }
 
+  const hasConfig = !!config;
+
   return (
     <div className="bg-white rounded-xl shadow-md p-4 border border-slate-200">
       <div className="flex items-center gap-4 flex-wrap">
@@ -89,8 +91,8 @@ export function FileChooser({ onSelected, config }: FileChooserProps) {
             onClick={handleDownload}
             icon={Download}
             size="sm"
-            disabled={!config}
+            disabled={!hasConfig}
-            title="Download full config template"
+            title={hasConfig ? 'Download full config template' : 'Load or create a config first'}
           >
             Download
           </Button>