fix: improve Manage Templates link visibility and editor scroll bug

Add pulsing cyan dot + hover gear rotation to make the link noticeable.
Add overflow-y-auto to ScriptManagePage so the editor form scrolls.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/pages/ScriptManagePage.tsx

@@ -27,7 +27,7 @@ export default function ScriptManagePage() {
   }
 
   return (
-    <div className="p-6 max-w-5xl mx-auto">
+    <div className="p-6 max-w-5xl mx-auto h-full overflow-y-auto">
       {mode === 'list' ? (
         <ScriptTemplateListView onEdit={handleEdit} onCreate={handleCreate} />
       ) : (