scaffolder: fix actions page layout alignment

Add `alignItems="start"` to the top-level Flex container so the sidebar
and detail panels align to the top rather than stretching to equal height.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

plugins/scaffolder/src/components/ActionsPage/ActionsPage.tsx

@@ -195,7 +195,7 @@ export const ActionPageContent = () => {
   );
 
   return (
-    <Flex gap="6">
+    <Flex gap="6" alignItems="start">
       <Flex
         direction="column"
         gap="4"