Clear notifications count optimistically

src/state/models/me.ts

@@ -49,6 +49,10 @@ export class MeModel {
     }
   }
 
+  clearNotificationCount() {
+    this.notificationCount = 0
+  }
+
   async fetchStateUpdate() {
     const res = await this.rootStore.api.app.bsky.notification.getCount()
     runInAction(() => {

src/state/models/notifications-view.ts

@@ -332,6 +332,7 @@ export class NotificationsViewModel {
       await this.rootStore.api.app.bsky.notification.updateSeen({
         seenAt: new Date().toISOString(),
       })
+      this.rootStore.me.clearNotificationCount()
     } catch (e) {
       console.log('Failed to update notifications read state', e)
     }