Sync columnstore + Parallelism subtype icons from PerformanceStudio

[erikdarlingdata]

Summary

Ports the plan-viewer icon-routing work from PerformanceStudio PRs #285 and #288 (PS v1.9.0). Net result, since #288 replaced the temporary R/D/G overlay from #285 with real icons.

What ports

PlanIconMapper.GetIconName(physicalOp, storageType, logicalOp) — two new optional params:

• storageType="ColumnStore" on a Clustered Index Scan / Index Scan / Columnstore Index Scan (and the matching delete/insert/update/merge variants) routes to the columnstore_index_* icon. Covers both CCI and NCCI.
• logicalOp for PhysicalOp="Parallelism" routes the three subtypes to their own icons:
  • Repartition Streams → parallelism_repartition_streams
  • Distribute Streams → parallelism_distribute_streams
  • Gather Streams → parallelism_gather_streams (horizontal mirror of distribute, matching SSMS)

ShowPlanParser — the IconName assignment moves from right after PhysicalOp is parsed to after StorageType and LogicalOp are populated, so the new routing has the inputs it needs.

Three new icons added to Dashboard/Resources/PlanIcons/ and Lite/Resources/PlanIcons/. MIT-licensed contribution from @rferraton via PS #288. The existing <Resource Include="Resources\PlanIcons\*.png" /> glob in each csproj picks them up automatically.

What was deliberately not ported

• PS PlanViewerControl.axaml.cs overlay rendering (added in Issue #281 Gaps 1+2: Memory grant charts + File I/O throughput/latency/queued overlay #285, removed in Issue #284: Standardize chart save/export filenames #288). The overlay never existed in PM, so nothing to remove here.
• PS minimap and colored-links features (PS Issue #274: Query Store Regressions drill-down + TVF rewrite #276 / [FEATURE] Make Add Connection Dialog similar on both applications #289) — those are Avalonia rendering work and need separate WPF translation.

Background

Last upstream sync from PerformanceStudio was PR #856 on 2026-04-16, scoped to PlanAnalyzer.cs + BenefitScorer.cs. This is a follow-up scoped to plan-viewer icon routing only — no analyzer logic, no UI rewrites.

Test plan

• Dashboard builds clean (0 errors, only pre-existing warnings)
• Lite builds clean (0 errors, only pre-existing warnings)
• Open a plan with a columnstore scan in Dashboard — verify the columnstore icon shows
• Open a parallel plan in Dashboard — verify Repartition/Distribute/Gather Streams nodes show distinct icons
• Same checks in Lite

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