Adjust nav item heights on desktop

Reduce desktop-only nav conversation item height from 2.15rem to 2.08rem,
and apply the same height to the Models and MCP Servers nav entries so
they align with the conversation list on larger screens.

Author: claude

src/lib/components/NavConversationItem.svelte

@@ -56,7 +56,7 @@
 	data-sveltekit-noscroll
 	data-sveltekit-preload-data="tap"
 	href="{base}/conversation/{conv.id}"
-	class="group flex h-[2.15rem] flex-none items-center gap-1.5 rounded-lg pl-2.5 pr-2 text-gray-600 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-gray-700 max-sm:h-10
+	class="group flex h-[2.08rem] flex-none items-center gap-1.5 rounded-lg pl-2.5 pr-2 text-gray-600 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-gray-700 max-sm:h-10
 		{conv.id === page.params.id ? 'bg-gray-100 dark:bg-gray-700' : ''}"
 	onclick={(e) => {
 		if (e.detail >= 2) {

src/lib/components/NavMenu.svelte

@@ -217,7 +217,7 @@
 	{/if}
 	<a
 		href="{base}/models"
-		class="flex h-9 flex-none items-center gap-1.5 rounded-lg pl-2.5 pr-2 text-gray-500 hover:bg-gray-100 dark:text-gray-400 dark:hover:bg-gray-700"
+		class="flex h-9 flex-none items-center gap-1.5 rounded-lg pl-2.5 pr-2 text-gray-500 hover:bg-gray-100 sm:h-[2.08rem] dark:text-gray-400 dark:hover:bg-gray-700"
 		onclick={handleNavItemClick}
 	>
 		Models
@@ -230,7 +230,7 @@
 	{#if user?.username || user?.email}
 		<button
 			onclick={() => (showMcpModal = true)}
-			class="flex h-9 flex-none items-center gap-1.5 rounded-lg pl-2.5 pr-2 text-gray-500 hover:bg-gray-100 dark:text-gray-400 dark:hover:bg-gray-700"
+			class="flex h-9 flex-none items-center gap-1.5 rounded-lg pl-2.5 pr-2 text-gray-500 hover:bg-gray-100 sm:h-[2.08rem] dark:text-gray-400 dark:hover:bg-gray-700"
 		>
 			MCP Servers
 			{#if $enabledServersCount > 0}