rf: dom queries in layout and pages

src/routes/(app)/+page.svelte

@@ -42,7 +42,7 @@
 	let stopResponseFlag = false;
 	let autoScroll = true;
 	let processing = '';
-
+	let messagesContainerElement: HTMLDivElement;
 	let currentRequestId = null;
 
 	let selectedModels = [''];
@@ -140,8 +140,7 @@
 	};
 
 	const scrollToBottom = () => {
-		const element = document.getElementById('messages-container');
-		element.scrollTop = element.scrollHeight;
+		messagesContainerElement.scrollTop = messagesContainerElement.scrollHeight;
 	};
 
 	//////////////////////////
@@ -821,8 +820,11 @@
 		<div
 			class=" pb-2.5 flex flex-col justify-between w-full flex-auto overflow-auto h-0"
 			id="messages-container"
+			bind:this={messagesContainerElement}
 			on:scroll={(e) => {
-				autoScroll = e.target.scrollHeight - e.target.scrollTop <= e.target.clientHeight + 50;
+				autoScroll =
+					messagesContainerElement.scrollHeight - messagesContainerElement.scrollTop <=
+					messagesContainerElement.clientHeight + 50;
 			}}
 		>
 			<div