feat(frontend): TagsSkeleton and CountSkeleton for sidebar Suspense fallbacks

thoughts-frontend/components/loading-skeleton.tsx

@@ -32,3 +32,26 @@ export function ProfileSkeleton() {
     </Card>
   )
 }
+
+export function TagsSkeleton() {
+  return (
+    <Card>
+      <CardContent className="pt-4 space-y-2">
+        <Skeleton className="h-4 w-24 mb-3" />
+        {[...Array(5)].map((_, i) => (
+          <Skeleton key={i} className="h-6 w-full rounded-full" />
+        ))}
+      </CardContent>
+    </Card>
+  )
+}
+
+export function CountSkeleton() {
+  return (
+    <Card>
+      <CardContent className="pt-4 pb-4">
+        <Skeleton className="h-6 w-32" />
+      </CardContent>
+    </Card>
+  )
+}