[Neue] Buttons (#5406)

* Re-align button sizing

(cherry picked from commit bcec243bb59dfe468313d98ba61f464d9750feec)

* Use large, small, tiny

(cherry picked from commit 1dc333c2993ab7f2e0ac750c0670dcec9a7069d0)

* Tweaks

src/components/moderation/LabelsOnMeDialog.tsx

@@ -279,7 +279,7 @@ function AppealForm({
           testID="backBtn"
           variant="solid"
           color="secondary"
-          size="medium"
+          size="large"
           onPress={onPressBack}
           label={_(msg`Back`)}>
           <ButtonText>{_(msg`Back`)}</ButtonText>
@@ -288,7 +288,7 @@ function AppealForm({
           testID="submitBtn"
           variant="solid"
           color="primary"
-          size="medium"
+          size="large"
           onPress={onSubmit}
           label={_(msg`Submit`)}>
           <ButtonText>{_(msg`Submit`)}</ButtonText>