Add UI for vendor contact field inheritance from company:
- Show "(from company)" indicator for inherited fields
- Add "Reset" button per field to clear override
- Add "Reset All to Company" button for bulk reset
- Purple border styling for inherited fields
- Dynamic placeholder showing company values
JavaScript methods:
- resetFieldToCompany(fieldName): Reset individual field
- resetAllContactToCompany(): Reset all contact fields
- hasAnyContactOverride(): Check if any field is overridden
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Co-Authored-By: Claude <noreply@anthropic.com>