Replace derived table wrapping with direct TOP injection for SQL Server
to prevent error 8155 when inner SELECT produces unnamed columns (e.g.
SELECT @@version). Also preserves ORDER BY that was incorrectly stripped
by the previous approach.
Wrap ContentArea in KeepAlive to cache tab instances across switches.
Add a module-level pending-changes cache in useDataGridEditor so edits
survive DataGrid destruction caused by result eviction and reload.
t8y2