Separate active and running lane counts

[yvette-carlisle]

Summary

• keep project active_run_count aligned with visible active_runs
• add running_lane_count for lanes that are actually running
• update dashboard, Decodex App, docs, and regression tests for stopped/stale lanes

Verification

• cargo make fmt
• cargo make lint-fix
• cargo make test
• swift test --package-path apps/decodex-app
• python3 /Users/x/.codex/plugins/cache/hack-ink/playbook/0.3.0/scripts/semantic_drift_audit.py
• git diff --check