refactor: localStorageのaccountsはindexedDBで保持するように (#7609)

* accountsストアはindexedDBで保持するように

* fix lint

* fix indexeddb available detection

* remove debugging code

* fix lint

* resolve https://github.com/misskey-dev/misskey/pull/7609/files/ba756204b77ce6e1189b8443e9641f2d02119621#diff-f565878e8202f0037b830c780b7c0932dc1bb5fd3d05ede14d72d10efbc3740c
Firefoxでの動作を改善

* fix lint

* fix lint

* add changelog

src/client/init.ts

@@ -4,6 +4,15 @@
 
 import '@client/style.scss';
 
+//#region account indexedDB migration
+import { set } from '@client/scripts/idb-proxy';
+
+if (localStorage.getItem('accounts') != null) {
+	set('accounts', JSON.parse(localStorage.getItem('accounts')));
+	localStorage.removeItem('accounts');
+}
+//#endregion
+
 import * as Sentry from '@sentry/browser';
 import { Integrations } from '@sentry/tracing';
 import { computed, createApp, watch, markRaw } from 'vue';