test(web): wait for the reasoning row before the steer-all mid snapshot

The mid golden was racing the reasoning block's stream: captureStableAria
could freeze on the pre-render gap between steering acceptance and the
assistant step, pinning a snapshot without the Think row. Wait for the
[data-variant=think] row so the golden captures the complete assistant step.

apps/web/tests/snapshots/steer-all/mid-steer.expected.md

@@ -11,6 +11,11 @@
   - img
   - img
   - text: Context injection @deepseek-ai/dsh-system-prompt
+- text: Running
+- button "Think The user wants me to ask them a checkpoint question first, then continue with whatever they interject. Let me do exactly that.":
+  - img
+  - img
+  - text: Think The user wants me to ask them a checkpoint question first, then continue with whatever they interject. Let me do exactly that.
 - status: Deep diving...
 - text: "Interjection Interjection: include the word BANANA in your final reply."
 - button "Copy":

apps/web/tests/steering.e2e.ts

@@ -353,6 +353,10 @@ describe('web e2e: empty-draft Cmd+Enter steers the whole queue', () => {
       { timeout: 10_000 },
     ).toBe(2)
     expect(await page.locator('[data-queue-dock]').count()).toBe(0)
+    // The reasoning row streams independently of the steering handoff; wait
+    // for it so the mid snapshot pins the assistant step, not the pre-render
+    // gap a fast machine can catch between steering acceptance and the block.
+    await page.locator('[data-variant="think"]').first().waitFor({ timeout: 10_000 })
     const mid = await captureStableAria(page, '[class*="centerCol"]', scaffold.workspaceCwd)
     await compareOrRefreshGolden(STEER_ALL_MID, mid, MODE)