layout fix (#1408)

This PR fixes a layout bug 


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Refactor**
* Updated dashboard top-panel sizing to use viewport-aware height for a
more consistent fit across screen sizes.
* Improved dark-mode spacing to prevent clipping and ensure content
remains fully visible without extra scrolling.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: aadesh18

apps/dashboard/src/app/(main)/(protected)/projects/[projectId]/dashboards/[dashboardId]/page-client.tsx

@@ -391,7 +391,7 @@ function DashboardDetailContent({
     <PageLayout fillWidth noPadding>
       {/* Both panels are always in the DOM so the iframe never unmounts/reloads.
           The chat panel animates its width; the dashboard panel adjusts via flex-1. */}
-      <div data-full-bleed className="flex h-full">
+      <div data-full-bleed className="flex h-[calc(100vh-4.5rem)] dark:h-[calc(100vh-5.75rem)]">
         {/* Dashboard iframe panel */}
         <div
           className={cn(