feat: stream info card

closes #20

lib/widgets/stream_info.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
+import 'package:zap_stream_flutter/theme.dart';
+import 'package:zap_stream_flutter/utils.dart';
+import 'package:zap_stream_flutter/widgets/profile.dart';
+
+class StreamInfoWidget extends StatelessWidget {
+  final StreamEvent stream;
+
+  const StreamInfoWidget({super.key, required this.stream});
+
+  @override
+  Widget build(BuildContext context) {
+    final startedDate =
+        stream.info.starts != null
+            ? DateTime.fromMillisecondsSinceEpoch(stream.info.starts! * 1000)
+            : null;
+    return Padding(
+      padding: EdgeInsets.all(10),
+      child: Column(
+        spacing: 8,
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          ProfileWidget.pubkey(stream.info.host),
+          Text(
+            stream.info.title ?? "",
+            style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
+          ),
+          if (startedDate != null)
+            RichText(
+              text: TextSpan(
+                style: TextStyle(color: LAYER_5, fontSize: 14),
+                children: [
+                  TextSpan(text: "Started "),
+                  TextSpan(text: DateFormat().format(startedDate)),
+                ],
+              ),
+            ),
+          if (stream.info.summary?.isNotEmpty ?? false)
+            Text(stream.info.summary!),
+        ],
+      ),
+    );
+  }
+}