PM-4302 ai config fixes

[vas3a]

• The logic for showing the virtual AI screening phase now considers both "Submission" and "Checkpoint Submission" phases, ensuring the AI screening phase appears appropriately after either phase if present.
• The fallback display of the virtual AI screening phase is updated to handle the absence of either "Submission" or "Checkpoint Submission" phases, improving robustness.
• The "AI_ONLY" option is now hidden from the review mode dropdown in the ReviewSettingsSection component.

[github-actions]

[⚠️ maintainability]
The condition (index === submissionIndex || index === checkpointSubmissionIndex) is repeated multiple times in the code. Consider extracting this logic into a well-named function to improve maintainability and readability.

[github-actions]

[⚠️ maintainability]
The condition (submissionIndex === -1 || checkpointSubmissionIndex === -1) is repeated multiple times in the code. Consider extracting this logic into a well-named function to improve maintainability and readability.