Mason 0cf0bc6350 Restrict file dialog to .mflow files only and return to login on load error
- Remove "All files (*)" option from file dialog, only allow .mflow files
- Change error handling to return to login page instead of opening empty pipeline
- Update error message to be more specific about file format requirements
- Properly clean up dashboard window when file load fails

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Co-Authored-By: Claude <noreply@anthropic.com>
2025-08-07 12:23:34 +08:00
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