Release native known-total infinite scroll footer

[Dastari]

Summary

• release data-table-pro 5.3.0 with committed distribution output
• render a native count-only footer for infinite scrolling when totalRowCount is supplied
• keep unknown-total infinite scrolling footerless and suppress pagination controls
• use stable getRowId references throughout README examples
• cover controlled manual sorting with infinite scrolling across all adapters

Verification

• 327 Vitest tests
• lint, package and demo typechecks
• package and demo builds
• unchanged public API snapshot
• packed-consumer install/build
• bundle budgets
• local Playwright launch was unavailable because the host Chromium runtime lacks libnspr4; tests did not reach application code

Documentation

Updated README, API reference, migration guide, roadmap, and changelog.