feat: add indicator for enter-triggered model selection

src/lib/components/chat/ModelSelector/Selector.svelte

@@ -244,18 +244,20 @@
 								show = false;
 							}
 						}}
-
 					/>
 				</div>
 
 				<hr class="border-gray-100 dark:border-gray-800" />
 			{/if}
 
-			<div class="px-3 my-2 max-h-64 overflow-y-auto scrollbar-hidden">
-				{#each filteredItems as item}
+			<div class="px-3 my-2 max-h-64 overflow-y-auto scrollbar-hidden group">
+				{#each filteredItems as item, index}
 					<button
 						aria-label="model-item"
-						class="flex w-full text-left font-medium line-clamp-1 select-none items-center rounded-button py-2 pl-3 pr-1.5 text-sm text-gray-700 dark:text-gray-100 outline-none transition-all duration-75 hover:bg-gray-100 dark:hover:bg-gray-800 rounded-lg cursor-pointer data-[highlighted]:bg-muted"
+						class="flex w-full text-left font-medium line-clamp-1 select-none items-center rounded-button py-2 pl-3 pr-1.5 text-sm text-gray-700 dark:text-gray-100 outline-none transition-all duration-75 hover:bg-gray-100 dark:hover:bg-gray-800 rounded-lg cursor-pointer data-[highlighted]:bg-muted {index ===
+						0
+							? 'bg-gray-100 dark:bg-gray-800 group-hover:bg-transparent'
+							: ''}"
 						on:click={() => {
 							value = item.value;