v0.2.13

• Fix: Gantt click on merged suite spans (pabot workers) now highlights tree node
• Replace misleading 'Total Spans' chart with 'DB Spans' (ClickHouse count, cached 5min) and 'Cached Spans' (browser allSpans.length)
• Remove server-side monotonic ingested span counter
• Consistent badge ordering, auto-extend lookback cap, loading banner fix