refactor: find in page (#7086)

- refactor rxjs data flow
- use canvas text to mitigate searchable search box input text issue

packages/frontend/electron-api/src/index.ts

@@ -9,7 +9,6 @@ import type {
 import type {
   affine as exposedAffineGlobal,
   appInfo as exposedAppInfo,
-  cmdFind as exposedCmdFind,
 } from '@affine/electron/preload/electron-api';
 
 type MainHandlers = typeof mainHandlers;
@@ -40,8 +39,5 @@ export const events = (globalThis as any).events as ClientEvents | null;
 export const affine = (globalThis as any).affine as
   | typeof exposedAffineGlobal
   | null;
-export const cmdFind = (globalThis as any).cmdFind as
-  | typeof exposedCmdFind
-  | null;
 
 export type { UpdateMeta } from '@affine/electron/main/updater/event';