feat: live painting (#49)

## Motivation

We improved live-painting:

- advanced python script lifecycle control
- first version of a e2e test

---------

Co-authored-by: Tim Pietrusky <[email protected]>

playwright/live-painting.test.ts

@@ -0,0 +1,24 @@
+import type { ElectronApplication, Page } from "@playwright/test";
+import { test, expect } from "@playwright/test";
+import { _electron as electron } from "playwright";
+
+let electronApp: ElectronApplication;
+let page: Page;
+
+test.beforeAll(async () => {
+	electronApp = await electron.launch({ args: ["."] });
+	const isPackaged = await electronApp.evaluate(async ({ app }) => app.isPackaged);
+
+	expect(isPackaged).toBe(false);
+});
+
+test.afterAll(async () => {
+	await electronApp.close();
+});
+
+test.skip("Open Live Painting", async () => {
+	page = await electronApp.firstWindow();
+
+	await page.getByTestId("sidebar-live-painting").click();
+	await expect(page.url()).toContain("live-painting");
+});