- Button.tsx: contained variant's hover now uses HOVER.DARKEN=0.06
instead of MUI's default 16%, which was visibly heavy on the green
primary buttons across the app. Also fixes a subtle bug where the
earlier hover sx merge order silently dropped the boxShadow:'none'
reset. Added a HOVER token group to constants.ts so the darken value
has a single source of truth.
- TextInput.tsx: forward the caller's sx to the wrapper Stack when a
fieldLabel is present (previously it was applied to the inner
TextField, so flex:1 etc. didn't propagate to the visible width).
Inner sx now also explicitly width:100% so wrapped inputs don't
collapse to content width when their parent is a flex row.
- FieldLabel.tsx: drop the hardcoded fontSize:'14px' and use
variant=body1 (=13px from theme) to match the rest of the app's
body typography.