fix: allow BaseViewTemplate content to scroll when taller than viewport

Using items-center on a flex container with overflow-auto cuts off the
top of content that exceeds the viewport height because flex centering
doesn't interact with scrolling. Replace with an m-auto inner wrapper,
which still centers short content but lets tall content flow naturally
and scroll. Fixes the long /connect panel being unscrollable.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/views/templates/BaseViewTemplate.vue

@@ -13,8 +13,10 @@
       ref="topMenuRef"
       class="app-drag h-(--comfy-topbar-height) w-full"
     />
-    <div class="flex w-full grow items-center justify-center overflow-auto">
-      <slot />
+    <div class="flex w-full grow justify-center overflow-auto">
+      <div class="m-auto py-8">
+        <slot />
+      </div>
     </div>
   </div>
 </template>