fix(core): observe dock sidebar size in the popup's own realm

[SaKaNa-Y]

Description

In popup dock mode, resizing the popup window does not update the dock sidebar group rail immediately.

When shrinking the popup window, the group rail does not collapse into the overflow ("more") icon as expected. when enlarging the popup window, the hidden icons do not restore immediately. the state is only updated after moving the mouse into the host page.

Linked Issues

Additional context

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@vitejs/devtools

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@vitejs/devtools-kit

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@vitejs/devtools-oxc

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@vitejs/devtools-rolldown

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@vitejs/devtools-vitest

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commit: a130825

[SaKaNa-Y]

Most functionality is now working properly in popup mode. However, the Vite and Rolldown Modules Graph feature still has a minor issue when running in popup mode.