Add up-shadow in input area

apps/app/src/features/openai/client/components/AiAssistant/AiAssistantSidebar/AiAssistantSidebar.module.scss

@@ -24,6 +24,10 @@
     -webkit-backdrop-filter: blur(10px);
     backdrop-filter: blur(10px);
   }
+
+  .input-form-area {
+    box-shadow: 0 -10px 20px 10px rgba(var(--bs-body-bg-rgb), 1),
+  }
 }
 
 // == Colors

apps/app/src/features/openai/client/components/AiAssistant/AiAssistantSidebar/AiAssistantSidebar.tsx

@@ -494,7 +494,7 @@ const AiAssistantSidebarSubstance: React.FC<AiAssistantSidebarSubstanceProps> =
           </SimpleBar>
         </div>
 
-        <div className="position-sticky bottom-0 bg-body z-2 p-3">
+        <div className="input-form-area position-sticky bg-body z-2 p-3">
           <form onSubmit={form.handleSubmit(submit)} className="flex-fill vstack gap-1">
             <Controller
               name="input"