fix(editor): 新文档回到顶部 + 超链接用系统浏览器打开 + 链接气泡仅选中时弹出

packages/shared/src/types/ipc.ts

@@ -43,6 +43,7 @@ export const IPC = {
   appearanceSave: 'appearance:save',
   keymapLoad: 'keymap:load',
   keymapSave: 'keymap:save',
+  openExternal: 'open:external',
 } as const;
 export type IpcChannel = (typeof IPC)[keyof typeof IPC];
 
@@ -86,6 +87,7 @@ export interface IpcMap {
   [IPC.appearanceSave]: { args: { themeId: string; params: Record<string, unknown>; effect: string; bgImage: string | null }; result: void };
   [IPC.keymapLoad]: { args: void; result: { id: string; combo: string }[] | null };
   [IPC.keymapSave]: { args: { id: string; combo: string }[]; result: void };
+  [IPC.openExternal]: { args: { url: string }; result: void };
 }
 
 // 类型安全的 invoke 帮助器签名（preload 暴露 + 渲染层使用）