docs: Add transaction submission status tracking guide

[KyleAMathews]

🎯 Changes

Added comprehensive documentation for tracking submission status of offline transactions in the offline-transactions package README. This new section covers:

• Using the Transaction Object: Explains how to check transaction state and wait for server confirmation using tx.state and tx.isPersisted.promise
• Tracking Per-Item Status: Provides a practical example of maintaining a map of pending transactions to show sync indicators in UI
• Monitoring the Offline Outbox: Documents executor methods (getPendingCount(), getRunningCount(), peekOutbox()) for visibility into queued transactions and retry information
• Using Inside mutationFns: Shows how the transaction lifecycle works within mutation functions, including automatic state transitions and rollback behavior

This documentation addresses a common need in offline-first applications and provides developers with clear patterns and examples for implementing submission status tracking.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm test:pr.

🚀 Release Impact

• This change is docs/CI/dev-only (no release).

https://claude.ai/code/session_01UHyeQv9yEn4FKK49mK9Vvw

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commit: 7a8ed61

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