fix: filtered-label preview mismatch in replace mode

[lipikaramaswamy]

Summary

• Make replace-mode preview/rendering use the filtered entity set instead of the full detected set
• Ensure display_record() matches the entities actually used for replacement when filter_labels is set
• Add a regression test covering filtered preview behavior

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Refactoring

Testing

• Tests pass locally
• Added/updated tests for changes