feat: M5 外观特效选择+持久化（appearance:load/save IPC+config.json，鼠效 6 选格接 EffectEngine，重开恢复并接线）

packages/shared/src/types/ipc.ts

@@ -27,6 +27,8 @@ export const IPC = {
   winClose: 'win:close',
   copyMd: 'doc:copy-md',
   printPdf: 'doc:print-pdf',
+  appearanceLoad: 'appearance:load',
+  appearanceSave: 'appearance:save',
 } as const;
 export type IpcChannel = (typeof IPC)[keyof typeof IPC];
 
@@ -54,6 +56,8 @@ export interface IpcMap {
   [IPC.winClose]: { args: void; result: void };
   [IPC.copyMd]: { args: { path: string }; result: string };
   [IPC.printPdf]: { args: void; result: void };
+  [IPC.appearanceLoad]: { args: void; result: { themeId: string; params: Record<string, unknown>; effect: string } | null };
+  [IPC.appearanceSave]: { args: { themeId: string; params: Record<string, unknown>; effect: string }; result: void };
 }
 
 // 类型安全的 invoke 帮助器签名（preload 暴露 + 渲染层使用）