fix: 修复研究助手首屏滚动与欢迎区布局

frontend/tests/ai-layout.spec.ts

@@ -0,0 +1,71 @@
+import { expect, test } from "@playwright/test";
+
+for (const viewport of [
+  { width: 1440, height: 850 },
+  { width: 390, height: 650 },
+]) {
+  test(`assistant opens with welcome and composer in view at ${viewport.width}`, async ({
+    page,
+  }) => {
+    await page.setViewportSize(viewport);
+    await page.route("**/api/v1/ai/conversations", (route) =>
+      route.fulfill({ json: [] }),
+    );
+    await page.route("**/api/v1/account", async (route) => {
+      const response = await route.fetch();
+      await route.fulfill({
+        json: { ...(await response.json()), theme: "dark" },
+      });
+    });
+    if (viewport.width === 1440)
+      await page.route("**/api/v1/ai/settings", (route) =>
+        route.fulfill({ json: { enabled: true, ready: true } }),
+      );
+    await page.goto("/");
+    await page
+      .getByLabel("密码", { exact: true })
+      .fill("browser-test-password");
+    await page.getByRole("button", { name: "进入工作空间" }).click();
+    await page.evaluate(() => document.body.setAttribute("theme-mode", "dark"));
+    await page.getByRole("button", { name: "切换研究助手" }).click();
+    const chat = page.getByRole("complementary", { name: "AI 研究助手" });
+
+    await expect(
+      chat.getByRole("heading", { name: "从当前研究出发" }),
+    ).toBeInViewport();
+    await expect(
+      chat.getByRole("button", { name: "发送", exact: true }),
+    ).toBeInViewport();
+    await expect(page.locator("body")).toHaveAttribute("theme-mode", "dark");
+    await page.screenshot({
+      path: `../output/playwright/ai-layout-${viewport.width}.png`,
+    });
+    const start = chat.getByRole("button", { name: "开始新会话", exact: true });
+    expect(
+      await start.evaluate((button) => {
+        const outer = button.getBoundingClientRect();
+        return [...button.querySelectorAll("span")].every((span) => {
+          const inner = span.getBoundingClientRect();
+          return inner.top >= outer.top && inner.bottom <= outer.bottom;
+        });
+      }),
+    ).toBe(true);
+    await expect(
+      chat.locator(".research-ai-prompts, .research-ai-hint"),
+    ).toHaveCount(0);
+    expect(
+      await chat.evaluate((el) => el.scrollHeight <= el.clientHeight),
+    ).toBe(true);
+    await chat.getByRole("button", { name: "收起研究助手" }).click();
+    await page.getByRole("button", { name: "切换研究助手" }).click();
+    await expect(
+      chat.getByRole("heading", { name: "从当前研究出发" }),
+    ).toBeInViewport();
+    await page.evaluate(() =>
+      document.body.setAttribute("theme-mode", "light"),
+    );
+    await page.screenshot({
+      path: `../output/playwright/ai-layout-${viewport.width}-light.png`,
+    });
+  });
+}

frontend/tests/ai.spec.ts

@@ -84,13 +84,13 @@ test("model settings, text stream, contextual query, confirmation and preserved
   await page.getByRole("button", { name: "Alpha 管理", exact: true }).click();
   await page.getByRole("textbox", { name: "搜索 Alpha" }).fill("TEST0001");
   await page.getByRole("button", { name: "查询", exact: true }).click();
+  // Global tools sit below drawers; open the assistant before the Alpha detail.
+  await page.getByRole("button", { name: "切换研究助手" }).click();
   await page.locator(".alpha-link").click();
   await page.getByRole("tab", { name: "研究信息" }).click();
   await page
     .getByRole("textbox", { name: "研究备注" })
     .fill("尚未保存的人工研究草稿");
-  // A global launcher must remain reachable when the detail mask is open.
-  await page.getByRole("button", { name: "切换研究助手" }).click();
   const chat = page.getByRole("complementary", { name: "AI 研究助手" });
   await chat.getByRole("button", { name: "新会话", exact: true }).click();
   await expect(chat.locator(".research-ai-reference")).toContainText(
@@ -430,11 +430,6 @@ test("AI composer preserves literal text, IME input and drafts while generating"
     )
       sent.push(request.postDataJSON().message);
   });
-  await chat
-    .getByRole("button", { name: "查询当前研究对象与已有结果", exact: true })
-    .click();
-  await expect(input).toHaveText("查询当前研究对象与已有结果");
-  expect(sent).toEqual([]);
   await input.fill("SLOW <字段>");
   await input.dispatchEvent("keydown", {
     key: "Enter",