fix: add isolation to components with leaky z-index - #2004
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CheckboxInput, RadioListItem, Switch, Slider, and Thumbnail all use z-index internally (hidden inputs above visuals, thumb above track, remove button above image) but their containers lacked a stacking context, letting those values leak to the parent. Add isolation: isolate to each container so internal z-index stays scoped without affecting external layout.
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PR Analysis Report📚 Storybook PreviewView Storybook for this PR 🧪 Sandbox PreviewView Sandbox for this PR No new or modified components detected. Bundle Size Summary
Accessibility AuditStatus: No accessibility violations detected. Generated by PR Enrichment workflow | Storybook | Sandbox | View full report |
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Sweep of all
z-indexusage in core — five components use z-index internally but their containers lacked a stacking context, letting values leak to the parent.Adds
isolation: isolateto:checkboxWrapperradioWrapperswitchWrappertrackContainerrootCompanion to #2001 (Calendar). The remaining z-index sites are already contained (Field, Chat, CodeBlock, AppShell) or intentionally cross-boundary (SideNav sticky, Toast, Popover, Table resize, Resizable handle).