Simplify material validation tab by removing Excel-related data source options and associated logic, keeping only database-driven validation modes.
Changes:
- Remove Excel file and Excel full workflow radio buttons from UI
- Remove Excel file selector components (excel_existing_frame, excel_full_frame)
- Update _on_source_mode_change to handle only database modes
- Simplify start_validation input validation for database modes only
- Update _validation_worker to call only database validation methods
The UI now presents only two data source options:
1. Database - Full table validation
2. Database - ProductionID filtered validation
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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