fix(hub-ui): prevent popup dock rails from scrolling out of view

Retained iframe panes can remain wider than the active viewport after a
group sidebar appears. Their overflow lets Graph node centering scroll
the outer DockStandalone grid and move the primary dock rail offscreen.

Clip the outer grid and sized content viewport to contain retained panes
and prevent programmatic scrolling of the dock layout while preserving
iframe state and internal panel scrolling.

Author: SaKaNa-Y

packages/hub-ui/src/client/components/dock/DockStandalone.vue

@@ -52,7 +52,7 @@ function switchEntry(id: string | undefined) {
     <div v-if="!isRpcTrusted" class="h-screen w-screen of-hidden">
       <ViewBuiltinClientAuthNotice :context="context" />
     </div>
-    <div v-else class="h-screen w-screen of-hidden grid cols-[max-content_1fr]">
+    <div v-else class="h-screen w-screen of-clip grid cols-[max-content_1fr]">
       <div class="border-r border-base flex flex-col min-h-0">
         <div class="p2 border-b border-base flex">
           <BrandMark class="w-7 h-7 ma" />
@@ -79,7 +79,7 @@ function switchEntry(id: string | undefined) {
           :group="activeGroup"
           :selected-id="context.docks.selected?.id ?? null"
         />
-        <div class="relative flex-1 min-w-0 min-h-0">
+        <div class="relative flex-1 min-w-0 min-h-0 of-clip">
           <ViewEntry
             v-if="context.docks.selected && panes"
             :key="context.docks.selected.id"