feat: add auto-scroll functionality for new user queries

- Introduced NewQueryScrollHandler component to automatically scroll to the latest user message when a new query is submitted, enhancing user experience.
- Updated ChatHeader component to remove unnecessary border for a cleaner design.
- Adjusted ModelSelector styles for improved visual consistency and accessibility.

surfsense_web/components/assistant-ui/thread.tsx

@@ -262,6 +262,55 @@ const ThinkingStepsScrollHandler: FC = () => {
 	return null; // This component doesn't render anything
 };
 
+/**
+ * Component that handles auto-scroll when a new user query is submitted.
+ * Scrolls to position the new user message at the top of the viewport,
+ * similar to Cursor's behavior where the current query stays at the top.
+ */
+const NewQueryScrollHandler: FC = () => {
+	const messages = useAssistantState(({ thread }) => thread.messages);
+	const prevMessageCountRef = useRef<number>(0);
+	const prevLastUserMsgIdRef = useRef<string>("");
+
+	useEffect(() => {
+		const currentCount = messages.length;
+
+		// Find the last user message
+		const lastUserMessage = [...messages].reverse().find((m) => m.role === "user");
+		const lastUserMsgId = lastUserMessage?.id || "";
+
+		// Check if a new user message was added (not on initial load)
+		if (
+			prevMessageCountRef.current > 0 && // Not initial load
+			currentCount > prevMessageCountRef.current &&
+			lastUserMsgId !== prevLastUserMsgIdRef.current &&
+			lastUserMsgId
+		) {
+			// New user message added - scroll to make it visible at the top
+			// Use multiple attempts to ensure the DOM has updated
+			const scrollToNewQuery = () => {
+				// Find the last user message element
+				const userMessages = document.querySelectorAll('[data-role="user"]');
+				const lastUserMsgElement = userMessages[userMessages.length - 1];
+				if (lastUserMsgElement) {
+					// Scroll so the user message is at the top of the viewport
+					lastUserMsgElement.scrollIntoView({ behavior: "smooth", block: "start" });
+				}
+			};
+
+			// Delayed attempts to handle async DOM updates
+			requestAnimationFrame(scrollToNewQuery);
+			setTimeout(scrollToNewQuery, 50);
+			setTimeout(scrollToNewQuery, 150);
+		}
+
+		prevMessageCountRef.current = currentCount;
+		prevLastUserMsgIdRef.current = lastUserMsgId;
+	}, [messages]);
+
+	return null; // This component doesn't render anything
+};
+
 export const Thread: FC<ThreadProps> = ({ messageThinkingSteps = new Map() }) => {
 	return (
 		<ThinkingStepsContext.Provider value={messageThinkingSteps}>
@@ -275,6 +324,8 @@ export const Thread: FC<ThreadProps> = ({ messageThinkingSteps = new Map() }) =>
 					turnAnchor="top"
 					className="aui-thread-viewport relative flex flex-1 flex-col overflow-x-auto overflow-y-scroll scroll-smooth px-4 pt-4"
 				>
+					{/* Auto-scroll handler for new queries - positions new user messages at the top */}
+					<NewQueryScrollHandler />
 					{/* Auto-scroll handler for thinking steps - must be inside Viewport */}
 					<ThinkingStepsScrollHandler />
 

surfsense_web/components/new-chat/chat-header.tsx

@@ -48,7 +48,7 @@ export function ChatHeader({ searchSpaceId }: ChatHeaderProps) {
 	return (
 		<>
 			{/* Header Bar */}
-			<div className="flex items-center justify-between px-4 py-2 border-b border-border/30 bg-background/80 backdrop-blur-sm">
+			<div className="flex items-center justify-between px-4 py-2 bg-background/80 backdrop-blur-sm">
 				<ModelSelector onEdit={handleEditConfig} onAddNew={handleAddNew} />
 			</div>
 

surfsense_web/components/new-chat/model-selector.tsx

@@ -175,9 +175,10 @@ export function ModelSelector({ onEdit, onAddNew, className }: ModelSelectorProp
 					role="combobox"
 					aria-expanded={open}
 					className={cn(
-						"h-9 gap-2 px-3 rounded-xl border border-border/50 bg-background/50 backdrop-blur-sm",
-						"hover:bg-muted/80 hover:border-border transition-all duration-200",
+						"h-9 gap-2 px-3 rounded-xl border border-border/30 bg-background/50 backdrop-blur-sm",
+						"hover:bg-muted/80 hover:border-border/30 transition-all duration-200",
 						"text-sm font-medium text-foreground",
+						"focus-visible:ring-0 focus-visible:ring-offset-0",
 						className
 					)}
 				>
@@ -206,11 +207,11 @@ export function ModelSelector({ onEdit, onAddNew, className }: ModelSelectorProp
 			</PopoverTrigger>
 
 			<PopoverContent
-				className="w-[360px] p-0 rounded-xl shadow-lg border-border/50"
+				className="w-[360px] p-0 rounded-xl shadow-lg border-border/30"
 				align="start"
 				sideOffset={8}
 			>
-				<Command shouldFilter={false} className="rounded-xl relative">
+				<Command shouldFilter={false} className="rounded-xl relative [&_[data-slot=command-input-wrapper]]:border-0 [&_[data-slot=command-input-wrapper]]:px-0 [&_[data-slot=command-input-wrapper]]:gap-2">
 					{/* Switching overlay */}
 					{isSwitching && (
 						<div className="absolute inset-0 z-10 flex items-center justify-center bg-background/80 backdrop-blur-sm rounded-xl">
@@ -221,8 +222,7 @@ export function ModelSelector({ onEdit, onAddNew, className }: ModelSelectorProp
 						</div>
 					)}
 
-					<div className="flex items-center gap-2 border-b px-3 py-2 bg-muted/30">
-						<Bot className="size-4 text-muted-foreground" />
+					<div className="flex items-center gap-2 border-b border-border/30 px-3 py-2">
 						<CommandInput
 							placeholder="Search models..."
 							value={searchQuery}
@@ -300,7 +300,7 @@ export function ModelSelector({ onEdit, onAddNew, className }: ModelSelectorProp
 						)}
 
 						{filteredGlobalConfigs.length > 0 && filteredUserConfigs.length > 0 && (
-							<CommandSeparator className="my-1" />
+							<CommandSeparator className="my-1 bg-border/30" />
 						)}
 
 						{/* User Configs Section */}
@@ -362,7 +362,7 @@ export function ModelSelector({ onEdit, onAddNew, className }: ModelSelectorProp
 						)}
 
 						{/* Add New Config Button */}
-						<div className="p-2 border-t border-border/50 bg-muted/20">
+						<div className="p-2 bg-muted/20">
 							<Button
 								variant="ghost"
 								size="sm"