feat: add due dates support for todos

- Update Todo interface to include due_date, parent_id, level fields
- Add due_date parameter to NotesService.addTodo method
- Add due_date parameter to TodosService.createTodo method
- updateTodo already supports Partial<Todo> including due_date
- Backend migrations already created (003 and 004)
- Prepare foundation for due date UI in future updates

src/services/NotesService.ts

@@ -6,6 +6,9 @@ interface Todo {
   text: string;
   completed: boolean;
   position?: number;
+  due_date?: string;
+  parent_id?: number;
+  level?: number;
 }
 
 interface Image {
@@ -221,12 +224,17 @@ class NotesService {
   }
 
   // Todo management methods
-  async addTodo(noteId: number, text: string): Promise<Todo | null> {
+  async addTodo(noteId: number, text: string, dueDate?: string): Promise<Todo | null> {
     try {
+      const payload: any = { text };
+      if (dueDate) {
+        payload.due_date = dueDate;
+      }
+
       const response = await fetch(`/api/notes/${noteId}/todos`, {
         method: "POST",
         headers: AuthService.getHeaders(),
-        body: JSON.stringify({ text })
+        body: JSON.stringify(payload)
       });
 
       if (!response.ok) {

src/services/TodosService.ts

@@ -33,9 +33,13 @@ class TodosService {
     }
   }
 
-  async createTodo(text: string, priority?: boolean): Promise<Todo> {
+  async createTodo(text: string, priority?: boolean, dueDate?: string): Promise<Todo> {
     try {
-      const response = await axios.post(this.baseURL, { text, priority: priority || false, completed: false }, this.getAuthHeader());
+      const payload: any = { text, priority: priority || false, completed: false };
+      if (dueDate) {
+        payload.due_date = dueDate;
+      }
+      const response = await axios.post(this.baseURL, payload, this.getAuthHeader());
       return response.data;
     } catch (error) {
       console.error('Error creating todo:', error);