perf(neon): prevent rebuilds in NotificationIconButton

Signed-off-by: Nikolas Rimikis <leptopoda@users.noreply.github.com>

packages/neon/neon/lib/src/widgets/app_bar.dart

@@ -251,25 +251,19 @@ class _NotificationIconButtonState extends State<NotificationIconButton> {
           final notificationsImplementationData = notificationsAppImplementation.data!;
           final notificationBloc = notificationsImplementationData.getBloc(_account);
 
-          return StreamBuilder<int>(
-            stream: notificationsImplementationData.getUnreadCounter(notificationBloc),
-            builder: (final context, final unreadCounterSnapshot) {
-              final unreadCount = unreadCounterSnapshot.data ?? 0;
-              return IconButton(
-                key: Key('app-${notificationsImplementationData.id}'),
-                onPressed: () async {
-                  await _openNotifications(notificationsImplementationData);
-                },
-                tooltip: AppLocalizations.of(context).appImplementationName(notificationsImplementationData.id),
-                icon: NeonAppImplementationIcon(
-                  appImplementation: notificationsImplementationData,
-                  unreadCount: unreadCount,
-                  color: unreadCount > 0
-                      ? Theme.of(context).colorScheme.primary
-                      : Theme.of(context).colorScheme.onBackground,
-                ),
-              );
+          return IconButton(
+            key: Key('app-${notificationsImplementationData.id}'),
+            onPressed: () async {
+              await _openNotifications(notificationsImplementationData);
             },
+            tooltip: AppLocalizations.of(context).appImplementationName(notificationsImplementationData.id),
+            icon: StreamBuilder<int>(
+              stream: notificationsImplementationData.getUnreadCounter(notificationBloc),
+              builder: (final context, final unreadCounterSnapshot) => NeonAppImplementationIcon(
+                appImplementation: notificationsImplementationData,
+                unreadCount: unreadCounterSnapshot.data,
+              ),
+            ),
           );
         },
       );

packages/neon/neon/lib/src/widgets/app_implementation_icon.dart

@@ -1,4 +1,4 @@
-import 'package:flutter/widgets.dart';
+import 'package:flutter/material.dart';
 import 'package:meta/meta.dart';
 import 'package:neon/src/models/app_implementation.dart';
 
@@ -6,7 +6,7 @@ import 'package:neon/src/models/app_implementation.dart';
 class NeonAppImplementationIcon extends StatelessWidget {
   const NeonAppImplementationIcon({
     required this.appImplementation,
-    this.unreadCount = 0,
+    this.unreadCount,
     this.color,
     this.size,
     super.key,
@@ -14,7 +14,7 @@ class NeonAppImplementationIcon extends StatelessWidget {
 
   final AppImplementation appImplementation;
 
-  final int unreadCount;
+  final int? unreadCount;
 
   final Color? color;
 
@@ -22,6 +22,11 @@ class NeonAppImplementationIcon extends StatelessWidget {
 
   @override
   Widget build(final BuildContext context) {
+    final unreadCount = this.unreadCount ?? 0;
+
+    final color = this.color ??
+        (unreadCount > 0 ? Theme.of(context).colorScheme.primary : Theme.of(context).colorScheme.onBackground);
+
     final icon = Container(
       margin: const EdgeInsets.all(5),
       child: appImplementation.buildIcon(