* feat(request-pane): restore body tab scroll position on tab switch
When editing large request bodies (JSON/XML/text/sparql), switching to
another tab (params, headers, auth, etc.) and back would reset the
CodeMirror editor scroll position to the top.
Fix by persisting the scroll position to Redux on editor unmount (via
CodeEditor's onScroll prop) and restoring it on mount (via initialScroll),
mirroring the existing scroll restoration pattern in QueryResultPreview.
* test: add playwright tests for body scroll restoration
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Co-authored-by: naman-bruno <naman@usebruno.com>
9bdd439472