fix(plugins): 插件中心 - 修复协议分类筛选重复展示

Refs #428

web/test/plugin-category-sections.test.ts

@@ -0,0 +1,12 @@
+import { readFileSync } from "node:fs";
+import { describe, expect, test } from "bun:test";
+
+const source = readFileSync(new URL("../src/pages/plugins/index.tsx", import.meta.url), "utf8");
+
+describe("plugin category sections (#428)", () => {
+    test("limits rendered sections to the selected category, not just matching plugins", () => {
+        const sections = source.slice(source.indexOf("const pluginSections ="), source.indexOf("const selectCategory ="));
+        expect(sections).toContain('categoryFilter === "all" || section.key === categoryFilter');
+        expect(sections).toContain("[categoryFilter, filteredPlugins]");
+    });
+});