fix: Address openai-native.spec.ts test failure

Author: andrewginns

src/core/config/CustomModesManager.ts

@@ -193,14 +193,13 @@ export class CustomModesManager {
 			const result = customModesSettingsSchema.safeParse(settings)
 
 			if (!result.success) {
-				console.error(`[CustomModesManager] Schema validation failed for ${filePath}:`, result.error)
+				const issues = result.error.issues
+					.map((issue) => `• ${issue.path.join(".")}: ${issue.message}`)
+					.join("\n")
+				console.error(`[CustomModesManager] Schema validation failed for ${filePath}:\n${issues}`)
 
 				// Show user-friendly error for .roomodes files
 				if (filePath.endsWith(ROOMODES_FILENAME)) {
-					const issues = result.error.issues
-						.map((issue) => `• ${issue.path.join(".")}: ${issue.message}`)
-						.join("\n")
-
 					vscode.window.showErrorMessage(t("common:customModes.errors.schemaValidationError", { issues }))
 				}