Timer/blinking and blackout buttons (#406)

*feat: timer blink

*feat: blackout

---------

Co-authored-by: Fabian Posenau <fabian@fphome.de>
Co-authored-by: cv <34649812+cpvalente@users.noreply.github.com>

playwright.config.ts

@@ -23,11 +23,15 @@ const config: PlaywrightTestConfig = {
   },
   use: {
     screenshot: 'only-on-failure',
+    video: 'retain-on-failure',
     viewport: { width: 1920, height: 1080 },
     actionTimeout: 5000,
     baseURL: 'http://localhost:4001',
     ignoreHTTPSErrors: true,
     trace: 'on-first-retry',
+    launchOptions: {
+      slowMo: process.env.CI ? undefined : 250
+    }
   },
   projects: [
     {