Phase 3 of Canvas Professional Upgrade:
- Fix ConfigImporter API endpoint URL (/api/optimization/studies/...)
- Add currentStudyId prop to auto-select study in importer
- Parse response correctly (data.config instead of raw response)
- Replace file upload emoji with FolderOpen Lucide icon
- Add "Load Study Config" button to Setup canvas tab header
- Show button only when canvas is empty
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>