MILAB-6848: fix sc TCR domain mapping

[mchernys]

Greptile Summary

The PR corrects the display mapping between single-cell TCR chain letters and biological chain names while preserving stored chain values, so existing analyses are relabelled without rerunning.

• Single-cell chain (scChain) — persisted producer-position code used to select workflow columns; its A and B values remain unchanged.
• TCRAB — alpha/beta T-cell receptor type; its options change from A = Alpha, B = Beta to A = Beta, B = Alpha.
• TCRGD — gamma/delta T-cell receptor type; its options change from A = Gamma, B = Delta to A = Delta, B = Gamma.
• Receptor domain — dataset metadata identifying receptor type; it continues to determine which chain options the selector displays.
• Chain label — user-facing biological chain name associated with a stored letter; only this presentation mapping changes.

Confidence Score: 5/5

The PR appears safe to merge because it changes only the user-facing TCR chain labels while retaining the persisted values used by the workflow.

The selector still sends the same A/B chain codes through the model to workflow filtering, while the displayed TCRAB and TCRGD names are corrected to match the documented producer convention.

Important Files Changed

Filename	Overview
ui/src/utils.ts	Corrects the TCRAB and TCRGD labels associated with unchanged A/B producer-position values; no concrete defect was established.
.changeset/fix-sc-tcr-chain-letters.md	Documents the corrected producer mapping, compatibility behavior for existing blocks, and minor package releases.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  D[Dataset receptor domain] --> R{Receptor}
  R -->|TCRAB| AB[A = Beta<br/>B = Alpha]
  R -->|TCRGD| GD[A = Delta<br/>B = Gamma]
  AB --> S[Persisted scChain value A or B]
  GD --> S
  S --> W[Workflow chain-column filter]
  S --> L[Corrected user-facing label]

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_{Reviews (1): Last reviewed commit: "MILAB-6848: fix sc TCR domain mapping" | Re-trigger Greptile}

Context used:

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