New exceptions for specific decode failures:
- InvalidMagicBytesError: wrong mode or not a Stegasoo image
- ReedSolomonError: image too corrupted to recover
- NoDataFoundError, ModeMismatchError: additional clarity
Web UI now shows specific, actionable error messages:
- "Try a different mode (LSB/DCT)"
- "Image too corrupted, may have been re-saved"
- "Wrong credentials - check reference photo..."
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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