[refactor] move exclusiveSort to a data context, fixed to initial value

[severo]

see #449

[Copilot]

Pull request overview

This PR continues the refactor from issue #449 by moving the exclusiveSort flag out of direct data access and into the data-layer context so consumers can read a stable, initial value and reduce unnecessary prop plumbing.

Changes:

• Add ExclusiveSortContext + useExclusiveSort() to DataContext.
• Initialize exclusiveSort once in DataProvider (fixed to the data frame’s initial value) and provide it via context.
• Update HighTable/Slice to consume exclusiveSort from context instead of data.exclusiveSort.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/providers/DataProvider.tsx	Captures exclusiveSort on mount and provides it via a new context provider.
src/contexts/DataContext.ts	Introduces ExclusiveSortContext and a useExclusiveSort hook for consumption.
src/components/HighTable/Slice.tsx	Switches TableHeader’s exclusiveSort prop source to the new context hook.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.