fix(offline): keep prepared batches linear

[rdlabo]

Summary

• reserve one contiguous createdAt block for prepared batches
• read existing Outbox commands once instead of once per entry
• assert a product principal/scope lease immediately before the atomic commit

Verification

• focused OfflineSyncService: 116/116
• ESLint: pass
• kit package build: pass

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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🟡 新しく公開された設定用の型に説明コメントが付いていない

公開APIとして追加された設定の型に説明コメントが付いていない（PreparedOfflineBatchOptions at projects/kit/offline/src/lib/offline-sync.service.ts:76）ため、リポジトリ規約（AGENTS.md「Every public class, function, and type must have a JSDoc comment.」）に違反しています。
Impact: 利用者向けドキュメントが欠落し、公開パッケージの説明が不揃いになります。

規約と該当箇所

AGENTS.md の「When modifying this repo」項目3で、すべての public な class / function / type に JSDoc を必須としています。同ファイル内の他の公開型（projects/kit/offline/src/lib/offline-sync.service.ts:66-74 の PreparedOfflineCommand など）は JSDoc を持っており、export * from './lib/offline-sync.service'（projects/kit/offline/src/public-api.ts:18）により本型も公開APIとして出力されます。メンバー assertCurrent にはコメントがありますが、型自体にはありません。

Suggested change

	export interface PreparedOfflineBatchOptions {
	flush?: boolean;
	/** Product identity/scope lease asserted after all async preparation and immediately before the durable commit. */
	assertCurrent?: () => void;
	}
	/** Options for committing a prepared batch of Outbox commands in one serialized transaction. */
	export interface PreparedOfflineBatchOptions {
	flush?: boolean;
	/** Product identity/scope lease asserted after all async preparation and immediately before the durable commit. */
	assertCurrent?: () => void;
	}

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