fix: Handle C++ exceptions during capture item creation in Windows thumbnails

[seer-by-sentry[bot]]

Fixes CAP-DESKTOP-T7. The issue was that: Race condition between window enumeration and CreateForWindow causes Windows Graphics Capture API to throw an unhandled C++ exception on invalid HWND.

• Wrap try_as_capture_item calls in catch_unwind to handle C++ exceptions that can occur if the display or window is disconnected or destroyed between enumeration and capture.
• This prevents crashes in the thumbnail generation process.

This fix was generated by Seer in Sentry, triggered by Richie. 👁️ Run ID: 2575840

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