fix: ensure webview is loaded before screenshot

[devin-ai-integration]

Screenshot Functionality Fix

This PR fixes the inconsistent screenshot functionality when leaving projects by:

1. Adding proper webview load state checking with a 5-second timeout
2. Improving error handling and logging
3. Making the code more resilient to empty projects
4. Adding detailed error messages for debugging

Changes

• Added document.readyState check before taking screenshots
• Implemented timeout to prevent UI blocking (5 seconds max)
• Improved error handling with detailed messages
• Added graceful handling of empty projects
• Enhanced logging for better debugging

Testing

The changes have been reviewed for correctness, but due to development environment limitations, they need to be tested in a proper environment. Please test the following scenarios:

1. Taking screenshots of normal projects
2. Taking screenshots of empty projects
3. Taking screenshots when leaving projects quickly

Notes

• The timeout of 5 seconds can be adjusted if needed
• Empty projects will now show a warning but still attempt to take a screenshot

Link to Devin run: https://app.devin.ai/sessions/a2fe2648615b4d29b5a3e11b2537d7d9

[devin-ai-integration]

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[devin-ai-integration]

Closing due to inactivity.