fix: move sent times below Agent message bubbles

tests/e2e/cloud-agents.spec.ts

@@ -335,12 +335,19 @@ test('personal cloud Agent identity, configuration and separate published chat i
     const answerTime = formalChat.locator('.agent-chat-message[data-role="assistant"] time');
     await expect(answerTime).toHaveAttribute('datetime', '2026-10-13T09:25:40.000Z');
     await expect(answerTime).toHaveAccessibleName(/^回复时间：/);
-    const bubbleStyle = await userBubble.evaluate(element => {
+    const bubbleBody = userBubble.locator('.agent-chat-message-body');
+    const bubbleStyle = await bubbleBody.evaluate(element => {
       const style = getComputedStyle(element);
       return { background: style.backgroundColor, radius: Number.parseFloat(style.borderTopLeftRadius) };
     });
     expect(bubbleStyle.background).not.toBe('rgba(0, 0, 0, 0)');
     expect(bubbleStyle.radius).toBeGreaterThan(0);
+    const bodyBounds = await bubbleBody.boundingBox();
+    const sentTimeBounds = await userBubble.locator('time').boundingBox();
+    expect(bodyBounds).not.toBeNull();
+    expect(sentTimeBounds).not.toBeNull();
+    expect(sentTimeBounds!.y).toBeGreaterThanOrEqual(bodyBounds!.y + bodyBounds!.height + 6);
+    await expect(userBubble).toHaveCSS('background-color', 'rgba(0, 0, 0, 0)');
     await expect(formalChat.locator('.agent-chat-message[data-role="assistant"]').getByRole('img', { name: '我的写作搭档头像', exact: true })).toHaveAttribute('src', avatar.icon_url);
     await expect(formalChat.getByLabel('消息', { exact: true })).toBeInViewport();
     const transcriptBounds = await formalChat.getByTestId('cloud-chat-messages').boundingBox();