This fixes modelcontextprotocol#273

* In Sidebar.tsx
  - In Reconnect button handler, call onDisconnect before onConnect

See: modelcontextprotocol/inspector#273 (comment)

Author: cliffhall

client/src/components/Sidebar.tsx

@@ -398,7 +398,13 @@ const Sidebar = ({
           <div className="space-y-2">
             {connectionStatus === "connected" && (
               <div className="grid grid-cols-2 gap-4">
-                <Button data-testid="connect-button" onClick={onConnect}>
+                <Button
+                  data-testid="connect-button"
+                  onClick={() => {
+                    onDisconnect();
+                    onConnect();
+                  }}
+                >
                   <RotateCcw className="w-4 h-4 mr-2" />
                   {transportType === "stdio" ? "Restart" : "Reconnect"}
                 </Button>