Plugin dir: changes to author profile name not reflected on plugin page

[tellyworth]

When a plugin author changes the name or display name in their WordPress.org user profile, plugin pages continue to display the old name in the byline.

Expected: the plugin directory theme should always pull the current author name from the user profile.

[dd32]

The "By xyz" author byline is pulled from the plugins plugin file directly, for example see ​Line 10 of the Hello Dolly plugin.

This change improves the layout of the Trac preferences controls on
report and query views.

By switching the prefs container to a flex layout in these contexts,
the controls are aligned consistently and no longer wrap awkwardly
or push the submit button out of place.

The update is intentionally scoped to:

• #content.report #prefs
• #content.query #prefs

so it does not affect ticket, admin, or other Trac views.