fix: make join review read only

frontend/src/api/types.ts

@@ -1,6 +1,8 @@
 export interface WidgetOption {
   id: string;
   label: string;
+  detail?: string;
+  rationale?: string;
   meta?: Record<string, unknown>;
   selected?: boolean;
   recommended?: boolean;
@@ -32,7 +34,7 @@ export interface WidgetDescriptor {
   phase?: string;
   title?: string;
   intro?: string;
-  widget: "info" | "select" | "multiselect" | "freetext" | "artifact-gate" | "artifact" | string;
+  widget: "info" | "select" | "multiselect" | "join-review" | "freetext" | "artifact-gate" | "artifact" | string;
   options?: WidgetOption[];
   reserved?: string[];
   allow_empty?: boolean;