fix: dataset TTL sync, toast failures, and retention persistence

[regeter]

This PR addresses several issues related to dataset lifecycle management and user notifications:

• Toast Notification Reliability: Removed a duplicate ToastContainer in DatasetLoading.js
• Clicking a dataset button now verifies the data's existence in storage; if the data has expired and been purged the UI gracefully removes the button and notifies the user.
• logic to respect manually set retentionDate values (e.g., for demo datasets). The system now picks the more distant date between any existing TTL and the auto-calculated 1-hour grace period.
• Immediate Expiry Feedback: Ensured that TTL warning toasts are triggered immediately upon dataset load.

[github-actions]

🎉 This PR is included in version 1.24.1 🎉

The release is available on GitHub release

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