feat: Implement a loading and empty state for recent & running threads (#257)

* feat: Implement a loading and empty state for recent & running threads

* cr

apps/web/src/app/(v2)/chat/page.tsx

@@ -9,7 +9,7 @@ import { Toaster } from "@/components/ui/sonner";
 import { Suspense } from "react";
 
 export default function ChatPage() {
-  const { threads } = useThreads<GraphState>(
+  const { threads, threadsLoading } = useThreads<GraphState>(
     process.env.NEXT_PUBLIC_MANAGER_ASSISTANT_ID,
   );
 
@@ -22,7 +22,10 @@ export default function ChatPage() {
       <Suspense>
         <Toaster />
         <GitHubAppProvider>
-          <DefaultView threads={displayThreads} />
+          <DefaultView
+            threads={displayThreads}
+            threadsLoading={threadsLoading}
+          />
         </GitHubAppProvider>
       </Suspense>
     </div>

apps/web/src/components/v2/default-view.tsx

@@ -17,6 +17,7 @@ import {
   GitPullRequest,
   Bug,
   FilePlus2,
+  Archive,
 } from "lucide-react";
 import { useRouter } from "next/navigation";
 import { ThreadDisplayInfo } from "./types";
@@ -33,13 +34,14 @@ import { Label } from "../ui/label";
 import { ContentBlocksPreview } from "../thread/ContentBlocksPreview";
 import { TooltipIconButton } from "../ui/tooltip-icon-button";
 import { ThemeToggle } from "../theme-toggle";
-import { ThreadCard } from "./thread-card";
+import { ThreadCard, ThreadCardLoading } from "./thread-card";
 
 interface DefaultViewProps {
   threads: ThreadDisplayInfo[];
+  threadsLoading: boolean;
 }
 
-export function DefaultView({ threads }: DefaultViewProps) {
+export function DefaultView({ threads, threadsLoading }: DefaultViewProps) {
   const router = useRouter();
   const apiUrl: string | undefined = process.env.NEXT_PUBLIC_API_URL ?? "";
   const assistantId: string | undefined =
@@ -149,14 +151,31 @@ export function DefaultView({ threads }: DefaultViewProps) {
               </Button>
             </div>
 
-            <div className="grid gap-3 md:grid-cols-2">
-              {threads.slice(0, 4).map((thread) => (
-                <ThreadCard
-                  key={thread.id}
-                  thread={thread}
-                />
-              ))}
-            </div>
+            {threadsLoading || threads.length ? (
+              <div className="grid gap-3 md:grid-cols-2">
+                {threadsLoading && threads.length === 0 && (
+                  <>
+                    <ThreadCardLoading />
+                    <ThreadCardLoading />
+                    <ThreadCardLoading />
+                    <ThreadCardLoading />
+                  </>
+                )}
+                {threads.slice(0, 4).map((thread) => (
+                  <ThreadCard
+                    key={thread.id}
+                    thread={thread}
+                  />
+                ))}
+              </div>
+            ) : (
+              <div className="flex items-center justify-center py-8">
+                <span className="text-muted-foreground flex items-center gap-2">
+                  <Archive className="size-4" />
+                  <span className="text-sm">No threads found</span>
+                </span>
+              </div>
+            )}
           </div>
 
           {/* Quick Actions */}

apps/web/src/components/v2/thread-card.tsx

@@ -11,6 +11,7 @@ import { ThreadDisplayInfo } from "./types";
 import { useRouter } from "next/navigation";
 import { Badge } from "../ui/badge";
 import { Button } from "../ui/button";
+import { Skeleton } from "../ui/skeleton";
 
 export function ThreadCard({ thread }: { thread: ThreadDisplayInfo }) {
   const router = useRouter();
@@ -136,3 +137,37 @@ export function ThreadCard({ thread }: { thread: ThreadDisplayInfo }) {
     </Card>
   );
 }
+
+export function ThreadCardLoading() {
+  return (
+    <Card className="border-border bg-card px-0 py-3 dark:bg-gray-950">
+      <CardHeader>
+        <div className="flex items-start justify-between">
+          <div className="min-w-0 flex-1">
+            <CardTitle className="text-foreground truncate text-sm font-medium">
+              <Skeleton className="h-5 w-48" />
+            </CardTitle>
+            <div className="mt-1 flex items-center gap-1">
+              <Skeleton className="h-3 w-3 rounded-full" />
+              <Skeleton className="h-3 w-32" />
+            </div>
+          </div>
+          <Skeleton className="h-6 w-24 rounded-full" />
+        </div>
+      </CardHeader>
+      <CardContent>
+        <div className="flex items-center justify-between">
+          <div className="flex items-center gap-2">
+            <Skeleton className="h-3 w-16" />
+            <Skeleton className="h-3 w-1" />
+            <Skeleton className="h-3 w-24" />
+          </div>
+          <div className="flex items-center gap-1">
+            <Skeleton className="h-5 w-5 rounded-full" />
+            <Skeleton className="h-5 w-5 rounded-full" />
+          </div>
+        </div>
+      </CardContent>
+    </Card>
+  );
+}