feat(tasks): support subtasks with inline creation, checklist and title progress bar

frontend/src/lib/api.ts

@@ -13,6 +13,7 @@ import {
   Team,
   TaskList,
   Thought,
+  SubTask,
   User,
   UserInvite,
 } from './types';
@@ -309,6 +310,7 @@ export const api = {
       taskListId?: string;
       kanbanStatus?: 'todo' | 'in_progress' | 'done';
       notes?: string;
+      subtasks?: SubTask[];
     }
   ): Promise<Thought> {
     return request<Thought>(`/api/v1/thoughts/${thoughtId}`, {