docs(learn): sync generated Playground pages

[hhimanshu]

Automated sync of the Learn > Playground feature pages, generated from source and published as plain MDX content. Review the rendered pages before merging — automated prose cleanup can leave rough edges.

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[hhimanshu]

Closing in favour of a fresh sync generated against current main.

This PR was generated from studio d614c56 and is clean on its own (+2409/-38, 12 new pages, scanned for private-repo names, internal paths and tooling refs — all zero). It went CONFLICTING only because #55 merged after it was cut, and both rewrite the same generated pages.

Since every file here is generated output, hand-resolving a 31-file conflict would be busywork with a real chance of committing a half-merged page. Re-running Publish docs against current main produces the same content cleanly, which is the safer path for a public site.

Nothing is lost — the chart-axis-labels page and the rest will land in the replacement sync.