refac: navbar styling

src/lib/components/chat/Chat.svelte

@@ -1926,7 +1926,7 @@
 			{initNewChat}
 		/>
 
-		<PaneGroup direction="horizontal" class="w-full h-full">
+		<PaneGroup direction="horizontal" class="w-full h-ful pt-2">
 			<Pane defaultSize={50} class="h-full flex w-full relative">
 				{#if $banners.length > 0 && !history.currentId && !$chatId && selectedModels.length <= 1}
 					<div class="absolute top-3 left-0 right-0 w-full z-20">

src/lib/components/chat/Messages.svelte

@@ -308,7 +308,7 @@
 	};
 </script>
 
-<div class="h-full flex">
+<div class="h-full flex pt-8">
 	{#if Object.keys(history?.messages ?? {}).length == 0}
 		<Placeholder {selectedModels} bind:prompt />
 	{:else}

src/lib/components/layout/Navbar.svelte

@@ -39,8 +39,13 @@
 </script>
 
 <ShareChatModal bind:show={showShareChatModal} chatId={$chatId} />
-<nav id="nav" class=" sticky py-2.5 top-0 flex flex-row justify-center z-10">
-	<div class=" flex max-w-full w-full mx-auto px-5 pt-0.5 md:px-[1rem]">
+
+<div class="sticky top-0 z-50 w-full px-1 py-2 -mb-8 flex items-center">
+	<div
+		class=" bg-gradient-to-b via-50% from-white via-white to-transparent dark:from-gray-900 dark:via-gray-900 dark:to-transparent pointer-events-none absolute inset-0 -bottom-7 z-[-1] blur"
+	></div>
+
+	<div class=" flex max-w-full w-full mx-auto px-5 pt-0.5 md:px-[1rem] bg-transparen">
 		<div class="flex items-center w-full max-w-full">
 			<div
 				class="{$showSidebar
@@ -178,4 +183,4 @@
 			</div>
 		</div>
 	</div>
-</nav>
+</div>