feat(ui): 统一面板空状态引导

src/components/olmap/common/PanelEmptyState.test.tsx

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+import { render, screen } from "@testing-library/react";
+import { DescriptionOutlined } from "@mui/icons-material";
+import PanelEmptyState, { SchemeQueryEmptyState } from "./PanelEmptyState";
+
+describe("PanelEmptyState", () => {
+  it("renders an accessible panel instruction", () => {
+    render(
+      <PanelEmptyState
+        icon={<DescriptionOutlined />}
+        title="尚未选择分析方案"
+        description="请在方案查询中打开一个方案。"
+      />,
+    );
+
+    expect(screen.getByRole("status")).toHaveAttribute("aria-live", "polite");
+    expect(screen.getByText("尚未选择分析方案")).toBeInTheDocument();
+    expect(screen.getByText("请在方案查询中打开一个方案。")).toBeInTheDocument();
+  });
+
+  it("distinguishes initial query guidance from an empty result", () => {
+    const { rerender } = render(
+      <SchemeQueryEmptyState hasQueried={false} />,
+    );
+
+    expect(screen.getByText("尚未查询历史方案")).toBeInTheDocument();
+
+    rerender(<SchemeQueryEmptyState hasQueried />);
+
+    expect(screen.getByText("未找到符合条件的方案")).toBeInTheDocument();
+    expect(
+      screen.getByText("请调整查询条件后重新查询，或先创建一个新方案。"),
+    ).toBeInTheDocument();
+  });
+
+  it("supports compact selection guidance", () => {
+    render(
+      <PanelEmptyState
+        variant="compact"
+        title="尚未选择阀门"
+        description="点击“选择阀门”，然后在地图上添加。"
+      />,
+    );
+
+    expect(screen.getByText("尚未选择阀门")).toBeInTheDocument();
+  });
+});