Refine Decodex App account usage display

[yvette-carlisle]

Summary

• move the 7d daily average into the 7d remaining row and remove the duplicate 7d used line
• show all active lane chips in a horizontal scroller instead of hiding overflow behind +X

Verification

• swift test --package-path apps/decodex-app
• apps/decodex-app/script/build_and_run.sh --verify
• git diff --check origin/main..HEAD