Add Stationery and Stationery Dark themes with notebook chrome.

Manila folders, ruled chat, post-it nav, and folder tabs; dark variant uses Catppuccin Mocha colors with muted stickies and soft glows.

src/app/pages/client/home/HomeThreadsCategory.tsx

@@ -154,7 +154,7 @@ export function HomeThreadsCategory({ rooms }: HomeThreadsCategoryProps) {
   if (threads.length === 0) return null;
 
   return (
-    <NavCategory>
+    <NavCategory data-nav-dropdown="">
       <NavCategoryHeader>
         <RoomNavCategoryButton
           closed={closedCategories.has(THREADS_CATEGORY_ID)}
@@ -164,15 +164,18 @@ export function HomeThreadsCategory({ rooms }: HomeThreadsCategoryProps) {
           My Threads
         </RoomNavCategoryButton>
       </NavCategoryHeader>
-      {!closedCategories.has(THREADS_CATEGORY_ID) &&
-        threads.map(({ room, thread }) => (
-          <ThreadNavItem
-            key={`${room.roomId}:${thread.id}`}
-            room={room}
-            thread={thread}
-            selected={false}
-          />
-        ))}
+      {!closedCategories.has(THREADS_CATEGORY_ID) && (
+        <div data-nav-rooms="">
+          {threads.map(({ room, thread }) => (
+            <ThreadNavItem
+              key={`${room.roomId}:${thread.id}`}
+              room={room}
+              thread={thread}
+              selected={false}
+            />
+          ))}
+        </div>
+      )}
     </NavCategory>
   );
 }