feat(agent): add frontend action bridge

.opencode/tools/view_history.ts

@@ -1,4 +1,5 @@
 import { tool } from "@opencode-ai/plugin";
+import { executeFrontendAction } from "./frontend_action.js";
 
 export default tool({
   description: "为选定的管网要素打开前端的历史记录或计算结果面板。",
@@ -23,8 +24,7 @@ export default tool({
       .optional()
       .describe("Optional ISO8601 end time."),
   },
-  async execute() {
-    // 返回短确认即可；面板打开动作由前端根据 tool_call 参数完成。
-    return "已打开计算结果面板。";
+  async execute(args, context) {
+    return executeFrontendAction("view_history", args, context);
   },
 });