tegwick dd3ba4df58 feat: add debug information panel for data loading transparency ...

Added comprehensive debug panel that displays:
- Field mappings (CSV columns → item properties)
- Template placeholders (required template fields)
- CSV data preview (headers, sample data, validation warnings)

The panel appears below the timeline viewer and helps troubleshoot:
- Missing or mismatched CSV columns
- Template structure issues
- Data format problems

Shows warnings when no valid items are found with actionable
troubleshooting steps.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-27 23:09:35 +01:00

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