test: 固化 80% 覆盖率 CI 门禁（统计/分支/函数/行）并补齐交互用例

vitest.config.ts

@@ -20,7 +20,14 @@ export default defineConfig({
       reporter: ['text', 'text-summary'],
       include: ['src/renderer/src/**/*.{ts,tsx}'],
       exclude: ['src/renderer/src/**/*.{test,spec}.{ts,tsx}', 'src/renderer/src/test/**', 'src/renderer/src/env.d.ts'],
-      all: true
+      all: true,
+      // CI 门禁：四项覆盖率不得低于 80%，否则测试失败
+      thresholds: {
+        statements: 80,
+        branches: 80,
+        functions: 80,
+        lines: 80
+      }
     }
   }
 })