web: add per-message unread control and display

web/src/graphql.rs

@@ -20,6 +20,14 @@ pub struct FrontPageQuery;
 )]
 pub struct ShowThreadQuery;
 
+#[derive(GraphQLQuery)]
+#[graphql(
+    schema_path = "graphql/schema.json",
+    query_path = "graphql/mark_read.graphql",
+    response_derives = "Debug"
+)]
+pub struct MarkReadMutation;
+
 pub async fn send_graphql<Body, Resp>(body: Body) -> Result<graphql_client::Response<Resp>, Error>
 where
     Body: Serialize,