fix(theme): switch thumb travels inside the track, toggle scene for the preview

preview/entry.ts

@@ -25,6 +25,7 @@ function press(element: Element | null | undefined): void {
 
 // Scenes for screenshots: open the page with a hash to land in a state.
 // Width comes from the window (``--window-size``), the state from here.
+// biome-ignore lint/complexity/noExcessiveCognitiveComplexity: one flat scene list
 async function main(): Promise<void> {
   const client = new FakeClient();
   const state = new PanelState();
@@ -33,7 +34,7 @@ async function main(): Promise<void> {
   if (scene === "empty") {
     state.selected = null;
   }
-  if (scene === "question") {
+  if (scene === "question" || scene === "toggle") {
     state.selected = BRANCH_BLASTER;
   }
   if (scene === "deep") {
@@ -95,6 +96,9 @@ async function main(): Promise<void> {
       })
     );
   }
+  if (scene.startsWith("toggle")) {
+    press(document.querySelector('[data-slot="switch"]'));
+  }
   if (scene.startsWith("actions")) {
     press(document.querySelector('[aria-label="Conversation actions"]'));
   }