feat: setup deep link handler

closes #34

lib/app.dart

@@ -76,7 +76,7 @@ void runZapStream() {
                   if (state.extra is StreamEvent) {
                     return StreamPage(stream: state.extra as StreamEvent);
                   } else {
-                    throw UnimplementedError();
+                    return StreamPage.loader(state.pathParameters["id"]!);
                   }
                 },
               ),
@@ -119,6 +119,21 @@ void runZapStream() {
                   ),
                 ],
               ),
+              GoRoute(
+                path: "/:id",
+                redirect: (context, state) {
+                  final id = state.pathParameters["id"]!;
+                  if (id.startsWith("naddr1") ||
+                      id.startsWith("nevent1") ||
+                      id.startsWith("note1")) {
+                    return "/e/$id";
+                  } else if (id.startsWith("npub1") ||
+                      id.startsWith("nprofile1")) {
+                    return "/p/$id";
+                  }
+                  return null;
+                },
+              ),
             ],
           ),
         ],

lib/pages/stream.dart

@@ -1,5 +1,6 @@
 import 'dart:developer' as developer;
 
+import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import 'package:ndk/ndk.dart';
@@ -24,6 +25,30 @@ class StreamPage extends StatefulWidget {
 
   const StreamPage({super.key, required this.stream});
 
+  static Widget loader(String id) {
+    final entity = decodeBech32ToTLVEntity(id);
+    return RxFilter<Nip01Event>(
+      Key("stream-loader:$id"),
+      filters: [entity.toFilter()],
+      builder: (context, state) {
+        final stream = state?.firstWhereOrNull(
+          (e) => e.getDtag() == entity.specialUtf8,
+        );
+        if (stream != null) {
+          return StreamPage(stream: StreamEvent(stream));
+        } else {
+          return Center(
+            child: SizedBox(
+              width: 40,
+              height: 40,
+              child: CircularProgressIndicator(),
+            ),
+          );
+        }
+      },
+    );
+  }
+
   @override
   State<StatefulWidget> createState() => _StreamPage();
 }