refactor: extract storage record utils

Author: ndycode

lib/storage.ts

@@ -27,6 +27,7 @@ import {
 	collectNamedBackups,
 	type NamedBackupSummary,
 } from "./storage/named-backups.js";
+import { clampIndex, isRecord } from "./storage/record-utils.js";
 import {
 	buildRestoreAssessment,
 	collectBackupMetadata,
@@ -958,15 +959,6 @@ export function deduplicateAccountsByEmail<
 	return deduplicateAccountsByIdentity(accounts);
 }
 
-function isRecord(value: unknown): value is Record<string, unknown> {
-	return !!value && typeof value === "object" && !Array.isArray(value);
-}
-
-function clampIndex(index: number, length: number): number {
-	if (length <= 0) return 0;
-	return Math.max(0, Math.min(index, length - 1));
-}
-
 function extractActiveAccountRef(
 	accounts: unknown[],
 	activeIndex: number,

lib/storage/record-utils.ts

@@ -0,0 +1,8 @@
+export function isRecord(value: unknown): value is Record<string, unknown> {
+	return !!value && typeof value === "object" && !Array.isArray(value);
+}
+
+export function clampIndex(index: number, length: number): number {
+	if (length <= 0) return 0;
+	return Math.max(0, Math.min(index, length - 1));
+}