fix: add error handling for tablewriter Bulk and Render calls

Add proper error checking for tw.Bulk() and tw.Render() method calls
in state clean and list commands to resolve errcheck linter errors.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: gambol99

pkg/cmd/tnctl/state/clean.go

@@ -134,8 +134,12 @@ func (o *CleanCommand) Run(ctx context.Context) error {
 
 	tw := cmd.NewTableWriter(o.Stdout())
 	tw.Header([]string{"Name", "Configuration", "Namespace", "Age"})
-	tw.Bulk(data)
-	tw.Render()
+	if err := tw.Bulk(data); err != nil {
+		return err
+	}
+	if err := tw.Render(); err != nil {
+		return err
+	}
 
 	if !o.Force {
 		o.Printf("\nYou have %d secrets orphaned which can be removed, do you wish to delete? (y/n) ", len(data))

pkg/cmd/tnctl/state/list.go

@@ -109,8 +109,12 @@ func (o *ListCommand) Run(ctx context.Context) error {
 		"Cost",
 		"Age",
 	})
-	tw.Bulk(data)
-	tw.Render()
+	if err := tw.Bulk(data); err != nil {
+		return err
+	}
+	if err := tw.Render(); err != nil {
+		return err
+	}
 
 	return nil
 }