feat: add custom widget flow workbench

packages/db/test/mysql-migration.spec.ts

@@ -55,7 +55,7 @@ describe("Mysql Migration", () => {
     const [customWidgetTables] = await connection
       .promise()
       .query<mysql.RowDataPacket[]>("SHOW TABLES LIKE 'custom_widget%'");
-    expect(customWidgetTables).toHaveLength(4);
+    expect(customWidgetTables).toHaveLength(5);
 
     // A single base64 image attachment already exceeds the 64KB that `text` holds on MySQL, so
     // `assistant_message.content` has to be `mediumtext`. Everything below 64KB passes either way.

packages/db/test/sqlite-migration.spec.ts

@@ -37,6 +37,7 @@ test("SQLite migrations seed the five disabled bundled custom widgets", async ()
       .prepare("SELECT name FROM sqlite_master WHERE type = 'table' AND name LIKE 'custom_widget%' ORDER BY name")
       .all(),
   ).toEqual([
+    { name: "custom_widget_content" },
     { name: "custom_widget_definition" },
     { name: "custom_widget_secret" },
     { name: "custom_widget_v2_definition" },