The merge_custom_widget_url migration (0039/0041/0007) was committed
without a corresponding snapshot, breaking drizzle-kit generate for
all future migrations. This adds:
- 0039/0041/0007 snapshots reflecting the merge-url changes
(base_url+endpoint -> url, add enabled column)
- 0040/0042/0008 snapshots reflecting the widget_secret table
All snapshot chains now match journal entries (41/43/9 entries each).