fix(ui): disabled primary chip, transaction badge, MCP sizes, ERD toolbar row

[ZhuchkaTriplesix]

Part of #1480 (the issue stays open for the items below).

Fixed

• 8: a disabled primary / destructive button is a grey chip (muted surface, mutedForeground label) instead of a half-transparent accent whose label was hard to read. Other disabled variants keep the fade.
• 9: the SQL toolbar's transaction badge reads Auto-commit / Manual commit before the first run, not Transaction —.
• 3: the MCP section buttons are md, like the rest of Preferences.
• 4 (partly): switch rows no longer inset their label by 4 px.
• 1: below 1100 px the ERD toolbar's Note, Auto layout and the hidden-tables / group buttons are icon-only (tooltips keep the names), so Export no longer wraps alone.

Not done

• 2 (lighter canvas rectangle in the light theme), 7 (menu ~12 px narrower than its trigger), 6 (Browse… is 1.5 px shorter than the path field), the slider label alignment in 4, and 5 (the ghost Close of Preferences stays: the standard says ghost). Each needs a look at a build rather than a guess.

Test: a disabled primary has no Opacity, a disabled secondary keeps it.