[Feature][Config UI] Improve the ux of the sync frequency setting

[Startrekzky]

Search before asking

• I had searched in the issues and found no similar feature requirement.

Use case

I wanted to set up a custom sync frequency of a blueprint, but I didn't know how to configure it via the cron expression. I had to google it and even after I input a value, I didn't know if it was correct as the UI only showed the next run time.

To Do

• Provide a link for users to reference, such as https://crontab.cronhub.io/
• List three future runs for users to preview
• Allow users to configure daily/weekly/... 0 AM based on their local timezone. For example, if a user is in UTC+2, and the user chooses daily, the sync time will be 0 AM in UTC +2 every day, not 2 AM in UTC +2 every day.

Prototypes

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

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[github-actions]

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[Startrekzky]

@mintsweet Can you update the link to cron job setting page to:

[Learn how to use cron code](https://crontab.cronhub.io/) or [auto-convert English to cron code](https://cron-ai.vercel.app/)

[mintsweet]

@Startrekzky Of course. Here's the PR #5732.