Cypress typescript (#13591)

* convert Cypress tests to TypeScript

this work was done by @lunaisnotaboy https://github.com/lunaisnotaboy
for their fork https://github.com/cutiekey/cutiekey/pull/7

I just repacked their changes into a minimal set

* fix call to `window` in cypress tests

this error was spotted thanks to the TypeScript compiler:

```
support/commands.ts:33:12 - error TS2559: Type '(win: any) => void'
has no properties in common with type 'Partial<Loggable &
Timeoutable>'.

33  cy.window(win => {
              ~~~~~~~~

Found 1 error in support/commands.ts:33
```

(again, @lunaisnotaboy did the actual work)

cypress/e2e/widgets.cy.ts

@@ -0,0 +1,76 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/* flaky
+describe('After user signed in', () => {
+	beforeEach(() => {
+		cy.resetState();
+		cy.viewport('macbook-16');
+
+		// インスタンス初期セットアップ
+		cy.registerUser('admin', 'pass', true);
+
+		// ユーザー作成
+		cy.registerUser('alice', 'alice1234');
+
+		cy.login('alice', 'alice1234');
+
+		// アカウント初期設定ウィザード
+		cy.get('[data-cy-user-setup] [data-cy-modal-window-close]').click();
+		cy.get('[data-cy-modal-dialog-ok]').click();
+	});
+
+	afterEach(() => {
+		// テスト終了直前にページ遷移するようなテストケース(例えばアカウント作成)だと、たぶんCypressのバグでブラウザの内容が次のテストケースに引き継がれてしまう(例えばアカウントが作成し終わった段階からテストが始まる)。
+		// waitを入れることでそれを防止できる
+		cy.wait(1000);
+	});
+
+  it('widget edit toggle is visible', () => {
+		cy.get('[data-cy-widget-edit]').should('be.visible');
+  });
+
+	it('widget select should be visible in edit mode', () => {
+		cy.get('[data-cy-widget-edit]').click();
+		cy.get('[data-cy-widget-select]').should('be.visible');
+  });
+
+	it('first widget should be removed', () => {
+		cy.get('[data-cy-widget-edit]').click();
+		cy.get('[data-cy-customize-container]:first-child [data-cy-customize-container-remove]._button').click();
+		cy.get('[data-cy-customize-container]').should('have.length', 2);
+	});
+
+	function buildWidgetTest(widgetName) {
+		it(`${widgetName} widget should get added`, () => {
+			cy.get('[data-cy-widget-edit]').click();
+			cy.get('[data-cy-widget-select] select').select(widgetName, { force: true });
+			cy.get('[data-cy-bg]._modalBg[data-cy-transparent]').click({ multiple: true, force: true });
+			cy.get('[data-cy-widget-add]').click({ force: true });
+			cy.get(`[data-cy-mkw-${widgetName}]`).should('exist');
+		});
+	}
+
+	buildWidgetTest('memo');
+	buildWidgetTest('notifications');
+	buildWidgetTest('timeline');
+	buildWidgetTest('calendar');
+	buildWidgetTest('rss');
+	buildWidgetTest('trends');
+	buildWidgetTest('clock');
+	buildWidgetTest('activity');
+	buildWidgetTest('photos');
+	buildWidgetTest('digitalClock');
+	buildWidgetTest('federation');
+	buildWidgetTest('postForm');
+	buildWidgetTest('slideshow');
+	buildWidgetTest('serverMetric');
+	buildWidgetTest('onlineUsers');
+	buildWidgetTest('jobQueue');
+	buildWidgetTest('button');
+	buildWidgetTest('aiscript');
+	buildWidgetTest('aichan');
+});
+*/