Nest TODO State in session data (#4361)

Co-authored-by: Alex Hancock <alexhancock@block.xyz>

ui/desktop/src/api/types.gen.ts

@@ -279,6 +279,14 @@ export type ExtensionConfig = {
     type: 'inline_python';
 };
 
+/**
+ * Extension data containing all extension states
+ * Keys are in format "extension_name.version" (e.g., "todo.v0")
+ */
+export type ExtensionData = {
+    [key: string]: unknown;
+};
+
 export type ExtensionEntry = ExtensionConfig & {
     type?: 'ExtensionEntry';
 } & {
@@ -682,6 +690,7 @@ export type SessionMetadata = {
      * A short description of the session, typically 3 words or less
      */
     description: string;
+    extension_data?: ExtensionData;
     /**
      * The number of input tokens used in the session. Retrieved from the provider's last usage.
      */
@@ -698,10 +707,6 @@ export type SessionMetadata = {
      * ID of the schedule that triggered this session, if any
      */
     schedule_id?: string | null;
-    /**
-     * Session-scoped TODO list content
-     */
-    todo_content?: string | null;
     /**
      * The total number of tokens used in the session. Retrieved from the provider's last usage.
      */