🧪 Add custom marker and empty input tests for split_filter_ids_for_fallback

[SatoryKono]

🎯 What: Add tests for custom title_only_marker_prefix and empty input lists for split_filter_ids_for_fallback.
📊 Coverage: Covers custom prefix logic and empty list handling.
✨ Result: Improved test robustness and documentation for edge cases.

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PR created automatically by Jules for task 11889934895464523170 started by @SatoryKono

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Project	Status	Preview	Updated (UTC)
biomoltech	🔴 Failed	–	May 27, 2026, 9:26 AM

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud