Fix json explorer hover jitter on large trees - #1732
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Closes #1350\n\nThis narrows hover highlight/focus handling so mouse enter/leave no longer cascades through the entire JSON tree. That keeps the hover state local and reduces the scroll churn that shows up as jitter in Preview mode.\n\nValidation:\n- git diff --check\n- code review of touched json_explorer path\n\nNote: Flutter/Dart tooling was not available in this environment, so I could not run the package test suite locally.