fix(ui): keep readable text contrast on Discard edits hover

The "Discard edits" button used `variant="outline"`, which injects
`hover:text-accent-foreground`. The local className overrode the hover
background (`hover:bg-amber-200`) but not the hover text color, so on
hover the text turned the light accent-foreground color over an amber
background, producing poor contrast.

Drop `variant="outline"` (default variant has no hover text-color rule)
and add `border` to the className. This matches the sibling "Save edits"
button's pattern. Text now stays `text-amber-950` in both default and
hover states.

Author: AmanVarshney01

ui/studio/views/table/ActiveTableView.tsx

@@ -1695,9 +1695,8 @@ export function ActiveTableView(_props: ViewProps) {
                   ? `${discardWiggleAnimationKey}-${discardWiggleCount}`
                   : undefined
               }
-              variant="outline"
               className={cn(
-                "h-9 border-amber-300 bg-amber-100 px-4 font-sans text-amber-950 hover:border-amber-400 hover:bg-amber-200 motion-safe:origin-center motion-safe:will-change-transform",
+                "h-9 border border-amber-300 bg-amber-100 px-4 font-sans text-amber-950 hover:border-amber-400 hover:bg-amber-200 motion-safe:origin-center motion-safe:will-change-transform",
                 discardWiggleAnimationClassName,
               )}
               onClick={() => setDiscardDialogOpen(true)}