Two fixes: Default initial entry fix for Structure sections + show developer hint when entry is missing body field

[johnfmorton]

This merge request introduces two updates to the Craft User Manual plugin:

1. Default Entry Selection Respects Structure Order

• Previously, when a section was defined as a Structure, the “default” manual entry was chosen based on creation date. As a result, the oldest entry appeared even if it wasn’t intended to be first.
• The removal of the 'orderBy' => 'dateCreated ASC' allows the default entry to show the expected entry when the section is a Structure. If the section is not a Structure, it falls back to newest by creation date. (Previously, it was oldest by creation date.)

2. Fix Developer Helper Notification in Default Template

• In the default template for rendering manual content, a conditional block was preventing the developer helper notification from appearing.
• That conditional has been corrected so that the helper notification (as previously defined in the template) now displays as intended.

TLDR:

• The manual opens on the entry specified by the Structure rather than arbitrary creation date.
• Developers see the helper notification without having to modify the template manually.

FYI: I've added notes in the CHANGELOG.md for these updates, but the actual version number will need to be updated if you accept these changes.

[johnfmorton]

Looking into a new issue. Sorry for the trigger finger merge request.

[johnfmorton]

Reopening after confirming the possible bug. It was not a bug after all. Thanks. -John

[johnfmorton]

After submitting the initial pull request, I noticed another user asked about support for a custom control panel trigger. I've added support for that as well.