fix(ui): show validation errors in form panel title instead of root container

When validation fails after clicking Save from the confirmation modal,
the error message is now correctly displayed in the form panel's title bar
(which has a border) rather than the root container title.

Author: tan9

internal/adapters/ui/server_form.go

@@ -1210,15 +1210,15 @@ func (sf *ServerForm) handleSave() bool {
 	data := sf.getFormData()
 
 	if errMsg := validateServerForm(data); errMsg != "" {
-		// Show error in title bar
-		sf.Flex.SetTitle(fmt.Sprintf("%s — [red::b]%s[-]", sf.titleForMode(), errMsg))
-		sf.Flex.SetBorderColor(tcell.ColorRed)
+		// Show error in form panel title bar
+		sf.formPanel.SetTitle(fmt.Sprintf("%s — [red::b]%s[-]", sf.titleForMode(), errMsg))
+		sf.formPanel.SetBorderColor(tcell.ColorRed)
 		return false // Validation failed
 	}
 
 	// Reset title and border on success
-	sf.Flex.SetTitle(sf.titleForMode())
-	sf.Flex.SetBorderColor(tcell.Color238)
+	sf.formPanel.SetTitle(sf.titleForMode())
+	sf.formPanel.SetBorderColor(tcell.Color238)
 
 	server := sf.dataToServer(data)
 	if sf.onSave != nil {