Fixed the inheritance UI to be based on formData content rather than
stale server state (vendor._inherited flags):
- "(from company)" shows when formData field is empty
- "Reset" shows when formData field has a value
- Purple border shows when formData field is empty
- formData initialization: empty for inherited, actual value for overrides
This ensures each field's UI is independent and reactive to user input.
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Co-Authored-By: Claude <noreply@anthropic.com>