Update site screenshots to hide scrollbars on Windows

[derekblank]

Resolves Automattic/dotcom-forge#7077

Proposed Changes

Updates CSS specificity in createScreenshotWindow waitForCapture to further hide scrollbars on Windows

Testing Instructions

1. Create site, and change theme to Seedlet
2. Start site on Windows
3. Observe that screenshot does not contain scrollbars (on macOS, behavior should be unchanged)

Note

This issue is difficult to replicate consistently. While this change should improve the behavior of not displaying scrollbars in screenshots on Windows, there may be a separate issue where either the theme still overrides the injected CSS, or the screenshot is captured before the extra CSS is injected.

Before	After

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[derekblank]

@wojtekn As referenced in the PR notes, I found it difficult to replicate the display of the scrollbars consistently. In all cases on macOS, the scrollbars were hidden. In some cases on Windows, repeatedly starting and stopping the server caused the scrollbars to reappear for the Seedlet theme (but only on Windows). I think this may possibly be due to an issue where the screenshot is captured before the extra CSS to hide the scrollbars is injected into the page.

I wanted to check on the priority of investigating this edge case, as the issue only seems to appear inter intermittently. WDYT?

[wojtekn]

@derekblank, thanks for preparing the fix. I played with multiple sites, using different themes, started and stopped them, and I couldn't reproduce it. Let's merge and close, and we can reopen if we spot it again.

FYI, I was reproducing that not only for the Seedlet theme but for the default one, too.

[derekblank]

Let's merge and close, and we can reopen if we spot it again.

Agreed, thanks for taking a look.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: Object has been destroyed <anonymous>(main/studio/./src/screenshot-window) View Issue

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