fix(general): some fixes and improvements of Play visibility (#14384)

* fix(backend): missing `visibility` param in packing flash

* fix(frontend): use `visibility` value got from API

* enhance(frontend): change preview appearance of private Play

* Update CHANGELOG.md

packages/backend/src/models/json-schema/flash.ts

@@ -44,6 +44,11 @@ export const packedFlashSchema = {
 			type: 'string',
 			optional: false, nullable: false,
 		},
+		visibility: {
+			type: 'string',
+			optional: false, nullable: false,
+			enum: ['private', 'public'],
+		},
 		likedCount: {
 			type: 'number',
 			optional: false, nullable: true,