feat: add donations feature with one-time payments - M6 (refs #55)

frontend/src/features/subscription/mobile/SubscriptionMobileScreen.tsx

@@ -5,6 +5,7 @@ import { format } from 'date-fns';
 import { GlassCard } from '../../../shared-minimal/components/mobile/GlassCard';
 import { MobileContainer } from '../../../shared-minimal/components/mobile/MobileContainer';
 import { PaymentMethodForm } from '../components/PaymentMethodForm';
+import { DonationSectionMobile } from '../components/DonationSectionMobile';
 import {
   useSubscription,
   useCheckout,
@@ -346,6 +347,10 @@ export const SubscriptionMobileScreen: React.FC = () => {
             </div>
           )}
         </GlassCard>
+
+        <Elements stripe={stripePromise}>
+          <DonationSectionMobile currentTier={subscription?.tier} />
+        </Elements>
       </div>
 
       <MobileModal