Support timeFormat in datetime field

[nhatrangnet]

https://app.asana.com/1/11768486970802/project/1200179452020411/task/1212702601974424

[opencode-agent]

Code Review Summary

Overview

This PR adds a new datetime_format control for datetime fields in the Meta Box Builder UI. The change adds 15 lines to Registry.php and makes a 1-line change in Fields.php.

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Issues Found

1. Breaking Change - Incomplete Implementation
The PR replaces format with datetime_format in Fields.php:177, but:

• The frontend component (assets/app/components/Editor/FieldTypePreview/Datetime.js:25) still uses field.format
• The new setting won't actually work until the frontend is updated to use field.datetime_format

2. Confusing Label Duplication

• Both format (line 136) and datetime_format (line 149) in Registry.php use the same label "Display format"
• Users may not understand the difference between date-only and datetime formats

3. Backward Compatibility Concern

• The old format control still exists in Registry but is no longer exposed to datetime fields
• Existing meta boxes using datetime with custom format settings may behave unexpectedly

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Recommendations

1. Update frontend component: Modify Datetime.js to read field.datetime_format instead of field.format

2. Consider keeping both: Either keep format available for datetime fields (for date-only display) or clarify the naming

3. Improve label clarity: Rename the label to "Display format (date + time)" to distinguish from the date-only format

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Security & Performance

• No security concerns identified
• No performance impact (only adds UI options)

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