refactor(output): share the JSON, created-resource and batch tails

Mutations end with a.jsonResult or a.created instead of hand-rolled
--json branches, the two identical jsonResult/writeMutationJSON helpers
become one, and writeBatchJSON checks --json itself so batch commands
share one tail.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/labels.go

@@ -226,15 +226,12 @@ func (a *application) askLabelDetails(cmd *cobra.Command, opts *services.LabelOp
 
 // reportLabel reports a created or updated label as JSON or with a ✓ line.
 func (a *application) reportLabel(cmd *cobra.Command, s services.Labels, item services.Label, updated bool) error {
-	if a.options.json != "" {
-		return a.writeJSON(cmd, item)
-	}
 	verb := "Created"
 	if updated {
 		verb = "Updated"
 	}
 	a.done(cmd, "%s %s", verb, labelName(s, item))
-	return nil
+	return a.jsonResult(cmd, item)
 }
 
 func (a *application) labelEditCommand(scope labelScope, complete cobra.CompletionFunc) *cobra.Command {
@@ -262,11 +259,8 @@ $ tea label edit old-stuff --archived`, Annotations: map[string]string{"tea.argu
 		if err != nil {
 			return err
 		}
-		if a.options.json != "" {
-			return a.writeJSON(cmd, item)
-		}
 		a.done(cmd, "Edited %s", labelName(s, item))
-		return nil
+		return a.jsonResult(cmd, item)
 	}}
 	fields.register(cmd, "Rename the label")
 	cmd.Flags().BoolVar(&byName, "by-name", false, "Match a numeric argument as a label name rather than an ID")
@@ -359,10 +353,7 @@ func (a *application) createLabels(cmd *cobra.Command, s services.Labels, rows [
 	}, func(item services.Label) {
 		a.done(cmd, "%s %s", outcome[item.Name], labelName(s, item))
 	})
-	if a.options.json != "" {
-		failures = append(failures, writeBatchJSON(a, cmd, len(rows), results))
-	}
-	return errors.Join(failures...)
+	return errors.Join(append(failures, writeBatchJSON(a, cmd, len(rows), results))...)
 }
 
 // completeScopedLabels completes the label names of the repository or, with --org, of the