feat(ui): update button variants following figma (#482)

* feat(ui): update button variants following figma

* feat(ui): separate size prop to allow for regular and small sized button variants

* update type to no longer include minimal-small

* update uno css config to use new spacing system

* add variants and sizes to file upload; update button and file upload stories

* add mini button variant and update small button

* specify width on icon-only regular variant

* update plus buttons to be mini sizes

* remove redundant classnames

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Co-authored-by: doprz <52579214+doprz@users.noreply.github.com>

src/views/components/PopupMain.tsx

@@ -132,12 +132,11 @@ export default function PopupMain(): JSX.Element {
                     <div className='bottom-0 right-0 mt-2.5 w-full flex justify-end'>
                         <Button
                             variant='filled'
+                            size='mini'
                             color='ut-burntorange'
-                            className='h-fit p-0 btn'
                             onClick={handleAddSchedule}
-                        >
-                            <Plus className='h-6 w-6' />
-                        </Button>
+                            icon={Plus}
+                        />
                     </div>
                 </ScheduleDropdown>
             </div>