fix(ui): one control height per toolbar row (ERD, results, SQL header) #1439

Problem

Rows of controls of different sizes sit side by side, which is what #1333 set out to remove:

• ERD toolbar: the Names / Keys / All strip is dense (28 px) next to md (32 px) buttons and menus.
• Results toolbar: the Grid / Groupings / Charts strip, icon buttons and the sm export menus are not one height.
• Sizes are written by hand almost everywhere (QueryaControlScope is used in 3 places).

Scope

• Wrap each toolbar in a QueryaControlScope and drop the per-control size: / dense: where it only repeats the scope.
• Replace dense: true on tab strips with size: so they follow the scope.
• Layout test per migrated toolbar: one height for every control in the row (the pattern of querya_control_row_height_test).

Found while driving a Linux debug build of dev after the button migration (UI consistency review). Part of epic #1331.