Add tests && add img lazy async

src/main.ts

@@ -1,6 +1,7 @@
 import "./ts/polyfill";
 import "core-js/actual"
 import "./ts/storage/database.svelte"
+import {declareTest} from "./test/runTest"
 import App from "./App.svelte";
 import { loadData } from "./ts/globalApi.svelte";
 import { initHotkey } from "./ts/hotkey";
@@ -13,6 +14,7 @@ let app = mount(App, {
 });
 loadData()
 initHotkey()
+declareTest()
 document.getElementById('preloading').remove()
 
 export default app;