fix(VAppBar): vertical main layout shift on SSR request #20563
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Description
Since we need to await to render the VToolbar from VAppBar, this PR just uses the props to calculate the computed height in VAppBar when VToolbar is not still present: on SSR page request this will prevent the vertical shift layout.
https://streamable.com/llbms5
resolves #15202 partially, now there is a flickering in the navigation drawer (we should also review the navigation drawer and the hydration missmatch): https://streamable.com/6pjzvc
related PR #15229
Markup: