Port fix from vitejs/devtools#522: prevent edge dock panel from scrolling its toolbar out of view

[antfubot]

Context

vitejs/devtools#522 ("fix(core): prevent edge dock panel from scrolling its toolbar out of view") by @SaKaNa-Y fixed unintended scrolling of the edge dock panel's toolbar when opening the Vite/Rolldown Modules Graph view. It touched packages/core/src/client/webcomponents/components/dock/DockEdge.vue (plus the generated CSS) in vitejs/devtools, which moved here as part of the v0.9 migration — the equivalent file today is packages/hub-ui/src/client/components/dock/DockEdge.vue.

Original PR description

Fixed the issue where opening the Vite / Rolldown Modules Graph Graph view could cause unintended scrolling of the edge dock panel.

Diff: https://github.com/vitejs/devtools/pull/522/files

For agents picking this up

• Read the diff at fix(core): prevent edge dock panel from scrolling its toolbar out of view vitejs/devtools#522 to see exactly how it constrained the toolbar/content scroll region (likely a layout/overflow fix isolating the toolbar from the scrollable content area).
• Locate packages/hub-ui/src/client/components/dock/DockEdge.vue here and re-implement the same fix, adapting to whatever has shifted since the fork.
• Credit @SaKaNa-Y as the original author: include a Co-authored-by: SaKaNa-Y <...> trailer (look up their GitHub noreply email, or omit if unavailable) and mention them in the PR description.
• Link back to fix(core): prevent edge dock panel from scrolling its toolbar out of view vitejs/devtools#522 in the PR description.
• Close this issue when the port merges.