fix(ui5-dynamic-page): prevent z-index conflicts with external components #12404
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The isolation property creates a new stacking context for the entire DynamicPage component, which allows us to use minimal z-index values (3 for header, 2 for footer) while maintaining proper internal layering. This prevents the component's high z-index values from conflicting with external elements like side navigation, without affecting the component's internal behavior. The isolation approach is preferred over adjusting z-index values as it doesn't create side effects with other components.
Fixes: #12360