Refactor ChainFormPage and challenge types to use 'taskIds' instead of 'tasks' for improved clarity and consistency in data handling.

src/types/challenge.ts

@@ -131,11 +131,11 @@ export interface UpdateTaskRequest {
 
 export interface CreateChainRequest {
   name: string
-  tasks: string[] // Array of task IDs
+  taskIds: string[] // Array of task IDs
 }
 
 export interface UpdateChainRequest {
   name?: string
-  tasks?: string[]
+  taskIds?: string[]
 }