chore: storybook (#15285)

Co-authored-by: David Hill <iamdavidhill@gmail.com>

packages/storybook/.storybook/manager.ts

@@ -0,0 +1,11 @@
+import { addons, types } from "storybook/manager-api"
+import { ThemeTool } from "./theme-tool"
+
+addons.register("opencode/theme-toggle", () => {
+  addons.add("opencode/theme-toggle/tool", {
+    type: types.TOOL,
+    title: "Theme",
+    match: ({ viewMode }) => viewMode === "story" || viewMode === "docs",
+    render: ThemeTool,
+  })
+})