feat(xlsx-viewer): expose getCellStyle for custom per-cell styling

[tothienbao6a0]

Summary

Forwards the new getCellStyle prop from @extend-ai/react-xlsx through the @extend/xlsx-viewer registry component, so consumers can apply custom per-cell styling (highlights, outlines, status tints) on top of the workbook's own Excel formatting — without forking the component.

• Threads getCellStyle through XlsxViewerPreview → XlsxViewerContent → XlsxWorkbookLoadedViewer → XlsxWorkbookSurface → XlsxViewer, typed via XlsxViewerProps["getCellStyle"] so the signature stays in sync with the underlying package.
• Bumps the @extend-ai/react-xlsx dependency (package.json + registry.json) to the release that adds the prop.
• Documents getCellStyle in the component's API reference.

Dependency / status

Draft — blocked on getCellStyle shipping in a published @extend-ai/react-xlsx release (upstream: extend-hq/react-xlsx#8). The version pin here is provisional and should be matched to whatever release includes that change. Ready to mark for review once the package is published.

Test plan

• pnpm typecheck (verified locally against a getCellStyle-enabled build of the package)
• pnpm registry:validate
• prettier --check on changed files
• pnpm build once the dependency release is available

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[tothienbao6a0]

Opening for visibility 👋 — this is the downstream half of extend-hq/react-xlsx#8.

It just forwards the new getCellStyle prop through the @extend/xlsx-viewer registry component (typed via XlsxViewerProps["getCellStyle"] so the signature stays in lockstep with the package), bumps the dependency, and documents the prop.

Kept as a draft on purpose: it's blocked on getCellStyle shipping in a published @extend-ai/react-xlsx release, so the version pin here is provisional. I verified typecheck / registry:validate / prettier locally against a getCellStyle-enabled build of the package.

Question for maintainers: once react-xlsx#8 lands and releases, do you want the pin matched to that exact version before this goes in? Happy to update and flip it out of draft whenever the release is cut.