Added immediate DOMContentLoaded handler to verify HTML is loading:
Debug Logging:
- Added console.log when DOM loads
- Added body element check and background color set
- Helps diagnose if HTML is loading at all
Fixes:
- Black screen debugging: can now see if HTML loads
- JavaScript execution: verifies scripts are running
- WebView loading: confirms WebView is serving HTML
Result: Can now diagnose if issue is HTML loading or JavaScript execution
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