Adding spans to test sets

This release introduces the ability to add spans to test sets, making it easier to bootstrap your evaluation data from production. The new feature lets you:

• Add individual or batch spans to test sets
• Create custom mappings between spans and test sets
• Preview test set changes before committing them

Additional improvements:

• Fixed CSV test set upload issues
• Prevented viewing of incomplete evaluations
• Added mobile compatibility warning
• Added support for custom ports in self-hosted installations