Material Validation Tab:
- Remove file selection area (file_group and related frames)
- Move output file path configuration to settings
- For User users: hide data source selection, only show shared production IDs
Settings Tab:
- Add "validation output file" configuration to path settings group
- Show "save settings" button for User users
- Add User-only mode to only show path settings group
Changes:
- material_validation_tab.py: Restructure control panel, update export_paths
- settings_tab.py: Add validation output filename, add save button for users
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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