feat(ask): add preview pane and wrapped content

src/schema.ts

@@ -10,7 +10,8 @@ export const AskOptionSchema = Type.Object({
 	),
 	preview: Type.Optional(
 		Type.String({
-			description: "Optional preview text, used by richer question variants",
+			description:
+				"Optional preview text shown in the dedicated preview pane for preview questions",
 		}),
 	),
 });
@@ -27,9 +28,6 @@ export const AskQuestionSchema = Type.Object({
 			{ description: "Question type" },
 		),
 	),
-	allowOther: Type.Optional(
-		Type.Boolean({ description: "Include a fixed 'Type something.' option" }),
-	),
 	required: Type.Optional(
 		Type.Boolean({
 			description: "Optional metadata flag; submit is never blocked",