2.0.4

feat(admin): "+ Create new" in the form header; the form foot keeps only submit (2.0.4)

While a flash sale is being edited, the head of the form shows the shared
x-gp247::form-new-button to return to an empty form (the list keeps its
page); the Cancel / Reset button at the foot is gone. The button ships with
GP247 Core 3.10, so requireCore is now 3.10; requireUpdateFrom becomes
minUpdateFrom.

Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com