perf(renderer): 整体优化响应速度 — rAF 合并编辑器刷新/自动保存缓存/粒子引擎空闲自停

同时: 不透明窗口 + 精简主题(8到2)、TabBar 简化、图谱宽松布局、MoreActions 层级修复

apps/desktop/tests/e2e/graph-render.spec.ts

@@ -60,18 +60,19 @@ test('思维导图+知识图谱渲染验证（含可见性）', async () => {
     const rects = svg.querySelectorAll('rect').length;
     const texts = svg.querySelectorAll('text').length;
     const lines = svg.querySelectorAll('line').length;
+    const linkPaths = svg.querySelectorAll('path').length;
     // Check a node card is visible within the svg
     const visibleCard = Array.from(svg.querySelectorAll('rect')).some((r) => {
       const b = r.getBoundingClientRect();
       return b.width > 0 && b.height > 0;
     });
-    return { found: true, w: rect.width, h: rect.height, rects, texts, lines, visibleCard };
+    return { found: true, w: rect.width, h: rect.height, rects, texts, lines, linkPaths, visibleCard };
   });
   console.log('Knowledge graph:', JSON.stringify(graph));
   expect(graph.found).toBe(true);
   expect(graph.h).toBeGreaterThan(100);
-  expect(graph.rects).toBeGreaterThanOrEqual(5);
-  expect(graph.lines).toBeGreaterThanOrEqual(1);
+  expect(graph.rects).toBeGreaterThanOrEqual(3); // 2 卡 rect + 1 背景 rect（demo 卡片无左侧色条）
+  expect(graph.linkPaths).toBeGreaterThanOrEqual(1); // 曲线连线为 path
   expect(graph.visibleCard).toBe(true);
 
   await app.close();