perf(model-pricing): refine visual editor actions

- keep the global reset action in the top toolbar while moving visual-mode saves into the model editor footer.
- pin the actions header with the rest of the model table headers so horizontal scrolling keeps context visible.
- add action icons to make save and reset controls easier to scan.

web/default/src/features/system-settings/models/model-ratio-table-columns.tsx

@@ -136,6 +136,7 @@ export function buildModelRatioColumns({
     },
     {
       id: 'actions',
+      header: () => <div className='text-right'>{t('Actions')}</div>,
       cell: ({ row }) => (
         <div className='flex justify-end gap-2'>
           <Button