remove store from being a property. also better animation

lib/widgets/editor/editor_toolbar.dart

@@ -42,26 +42,36 @@ enum HeaderLevel {
 class EditorToolbar extends HookWidget {
   final TextEditingController controller;
   final String instanceHost;
-  final EditorToolbarStore store;
   final FocusNode editorFocusNode;
   static const _height = 50.0;
 
-  EditorToolbar({
+  const EditorToolbar({
     required this.controller,
     required this.instanceHost,
     required this.editorFocusNode,
-  }) : store = EditorToolbarStore(instanceHost);
+  });
 
   @override
   Widget build(BuildContext context) {
     final visible = useListenable(editorFocusNode).hasFocus;
 
     return MobxProvider(
-      create: (context) => store,
+      create: (context) => EditorToolbarStore(instanceHost),
-      child: AsyncStoreListener(
+      child: ObserverBuilder<EditorToolbarStore>(builder: (context, store) {
+        return AsyncStoreListener(
           asyncStore: store.imageUploadState,
           child: AnimatedSwitcher(
-          duration: const Duration(milliseconds: 200),
+            duration: kThemeAnimationDuration,
+            transitionBuilder: (child, animation) {
+              final offsetAnimation =
+                  Tween<Offset>(begin: const Offset(0, 1.5), end: Offset.zero)
+                      .animate(animation);
+
+              return SlideTransition(
+                position: offsetAnimation,
+                child: child,
+              );
+            },
             child: visible
                 ? Container(
                     height: _height,
@@ -77,7 +87,8 @@ class EditorToolbar extends HookWidget {
                   )
                 : const SizedBox.shrink(),
           ),
-      ),
+        );
+      }),
     );
   }