Derive new_status from new_trajectory; fix sidebar check mark; fix question for incomplete

Show incomplete runs as incorrect; fix missing questions via BrowseComp JSONL fallback

Add question, correct answer, and accuracy to Selected Tools tab

Fix Selected Tools default variant (was hardcoded to removed traj_summary_ext)

Add traj_summary_orig_ext variant to Selected Tools tab with variant switcher

Show selected step indices in header

Add Selected Tools tab with side-by-side excerpt/trajectory viewer