[ZhuchkaTriplesix]

Closes #1772.

• sqlResultGridSaveEnabled now also reads the select list: a primary key counts only when the result has it as a plain column of the table (id, t.id, \"id\", id AS id) or the list holds a *. SELECT number AS id, name FROM t, id + 0 AS id or CAST(number AS int) AS id no longer enable Save (an UPDATE keyed on that id could change another row, and the one-row check passes when the value matches exactly one).
• TableMutationEngine._hasMatchingPrimaryKey uses every instead of any, so the preview warns when only part of a composite key is selected.
• Tests: aliased and expression columns, columns kept as they are, composite key. The check works on the SQL text, not on driver metadata, so an exotic select list is treated as not keyed (Save off) rather than guessed. Not run locally, CI will.