chore: all buttons rounded

Author: J-Sek

packages/vuetify/src/components/VDatePicker/VDatePickerControls.sass

@@ -56,10 +56,11 @@
 
     & &__only-month-btn,
     & &__only-year-btn
-      padding-inline: 4px 0
+      padding-inline: 12px 8px
+      min-width: 40px
 
       > .v-btn__append
-        margin-inline: 4px -6px
+        margin-inline: 4px -4px
 
   .v-date-picker__title
     display: inline-block

packages/vuetify/src/components/VDatePicker/VDatePickerControls.tsx

@@ -193,6 +193,7 @@ export const VDatePickerControls = genericComponent<VDatePickerControlsSlots>()(
           disabled={ disableMonth.value }
           text={ props.monthText }
           appendIcon={ props.modeIcon }
+          rounded
           onClick={ onClickMonth }
         />
       )
@@ -205,6 +206,7 @@ export const VDatePickerControls = genericComponent<VDatePickerControlsSlots>()(
           disabled={ disableYear.value }
           text={ props.yearText }
           appendIcon={ props.modeIcon }
+          rounded
           onClick={ onClickYear }
         />
       )