add toolbar to comments

lib/widgets/write_comment.dart

@@ -99,7 +99,9 @@ class WriteComment extends HookWidget {
           ),
         ],
       ),
-      body: ListView(
+      body: Stack(
+        children: [
+          ListView(
             children: [
               ConstrainedBox(
                 constraints: BoxConstraints(
@@ -130,6 +132,21 @@ class WriteComment extends HookWidget {
                   )
                 ],
               ),
+              Toolbar.safeArea,
+            ],
+          ),
+          SafeArea(
+            child: Column(
+              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+              children: [
+                const Spacer(),
+                Toolbar(
+                  controller: controller,
+                  instanceHost: post.instanceHost,
+                ),
+              ],
+            ),
+          ),
         ],
       ),
     );