Problem:
- File nodes had null file_uuid
- Clicking files in UI showed nothing (showDetail() returned early)
- User could not view file details
Solution:
- Set file_uuid to node_id (temporary value) during scan
- Even without SHA256 hash, files can be clicked
- file_uuid will be updated when hash is calculated
Result:
- All files have file_uuid ✅
- Clicking files shows detail panel ✅
- UI fully functional ✅
Files:
- src/scan.rs (file_uuid = node_id)
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