[Neue] Buttons (#5406)

* Re-align button sizing

(cherry picked from commit bcec243bb59dfe468313d98ba61f464d9750feec)

* Use large, small, tiny

(cherry picked from commit 1dc333c2993ab7f2e0ac750c0670dcec9a7069d0)

* Tweaks

src/screens/Login/SetNewPasswordForm.tsx

@@ -160,7 +160,7 @@ export const SetNewPasswordForm = ({
           label={_(msg`Back`)}
           variant="solid"
           color="secondary"
-          size="medium"
+          size="large"
           onPress={onPressBack}>
           <ButtonText>
             <Trans>Back</Trans>
@@ -174,7 +174,7 @@ export const SetNewPasswordForm = ({
             label={_(msg`Next`)}
             variant="solid"
             color="primary"
-            size="medium"
+            size="large"
             onPress={onPressNext}>
             <ButtonText>
               <Trans>Next</Trans>