Fix duplicating a Pod collapsing down to only 5 fields

[faisalahammad]

Description

When duplicating an ACT pod (Content Type "Pod") with many fields, the duplicated pod only kept the 5 auto-generated default fields (name, created, modified, author, permalink) and silently dropped all custom fields.

The duplicate routine creates a fresh skeleton pod first. For the "pod" type, saving that skeleton auto-creates a default "Details" group holding the 5 default fields. The loop that recreates the original groups then collides with that auto-created group, the error is silently caught, and the original custom fields never get copied.

This adds an internal bypass_default_groups flag that only the duplicate routine sets. It tells save_pod to skip auto-creating the default group so the loop below recreates the original groups fully. The flag is unset before the pod options are merged, so it never leaks into the duplicated pod's stored options. Normal pod creation is unchanged.

Related GitHub issue(s)

Fixes #7390

Testing instructions

1. Create an ACT pod (Content Type "Pod") with a group named details and 10 custom fields.
2. Mouse over the pod and click Duplicate.
3. Verify the duplicate contains all 10 custom fields plus the standard created, modified, author, permalink fields (14 total).
4. Create a new ACT pod and Save to confirm it still auto-creates the standard Details group / default fields (no regression).

Screenshots / screencast

None provided.

Changelog text for these changes

Bug: Duplicating an ACT pod now preserves all custom fields instead of collapsing down to 5. #7390 (@faisalahammad)

PR checklist

• I have tested my own code to confirm it works as I intended.
• My code follows the WordPress Coding Standards.
• My code follows the WordPress Inline Documentation Standards.
• My code includes automated tests for PHP and/or JS (if applicable).

[faisalahammad]

AI disclosure: this PR was written with Claude Opus 5 assistance, reviewed and tested by me.