fix: close zap modal after zap

closes #37

lib/pages/stream.dart

@@ -172,12 +172,15 @@ class _StreamPage extends State<StreamPage> with RouteAware {
                 showModalBottomSheet(
                   context: context,
                   constraints: BoxConstraints.expand(),
-                  builder: (ctx) {
+                  builder: (context) {
                     return SingleChildScrollView(
                       primary: false,
                       child: ZapWidget(
                         pubkey: stream.info.host,
                         target: stream.event,
+                        onPaid: (_) {
+                          context.pop();
+                        },
                         zapTags:
                             // tag goal onto zap request
                             stream.info.goal != null

lib/widgets/zap.dart

@@ -283,6 +283,7 @@ class _ZapWidget extends State<ZapWidget> {
       zapRequest: zapRequest,
     );
 
+    // auto pay with NWC
     final wallet = await loginData.value?.getWallet();
     if (wallet != null && invoice != null) {
       try {