Procedures grid plots logical reads under the physical-reads label, and two slicer labels call totals averages (#3547 siblings) #3556

Two verified sibling defects of #3547 in Lite's grid sorting handlers (Lite\Controls\ServerTab.Grids.cs), found during the #3547 work and confirmed by grep:

1. The procedures grid plots logical reads under a physical-reads label (:417): "TotalPhysicalReads" => ("TotalReads", "Total Physical Reads") — the exact #3547 bug one grid over: the physical sort maps to the logical aggregate and the value switch has no physical case. The QueryStore grid's fixed mapping (:324/:343, PR #3550) is the pattern to mirror; check whether the procedures slicer's source SELECT carries physical reads and thread it through the same way if absent (the #3550 timeline commit is the template).

2. Slice totals plotted under "Avg" labels (:369-370): "AvgLogicalReads" => ("TotalReads", "Avg Reads") and "AvgLogicalWrites" => ("TotalWrites", "Avg Writes") — the plotted bucket values are execution-weighted slice totals, so the labels under-claim what the bars show. Honest labels ("Total Reads"/"Total Writes", matching the #3550 precedent) or truly-average values; label fix preferred per the #3547 resolution.

From the 2026-09 brains-review wave (found in-flight during #3547; verified by grep before filing). Pinning: extend the ParitySource regex-pin pattern used by QueryStoreSlicerMetricMapTests to cover the procedures switch.