Paper Performance Rename Cleanup
Paper performance tracking is now consistently surfaced under Paper > Performance, with the old Trends shortcut retired.
- ImprovedPerformance is the canonical home for paper-trading snapshots, coaching, scoreboard, and leaderboard context.
- ImprovedRetired dashboard shortcuts were removed; open Performance from the Paper navigation.
- ImprovedAPI documentation and leaderboard labels now use Performance wording instead of Trends wording.