完整性更新

现在已经实现了大部分基础功能

src/modules/dashboard/components/teacher-dashboard/recent-submissions.tsx

@@ -0,0 +1,70 @@
+import Link from "next/link";
+
+import { Card, CardContent, CardHeader, CardTitle } from "@/shared/components/ui/card";
+import { Avatar, AvatarFallback, AvatarImage } from "@/shared/components/ui/avatar";
+import { EmptyState } from "@/shared/components/ui/empty-state";
+import { Inbox } from "lucide-react";
+import { formatDate } from "@/shared/lib/utils";
+import type { HomeworkSubmissionListItem } from "@/modules/homework/types";
+
+export function RecentSubmissions({ submissions }: { submissions: HomeworkSubmissionListItem[] }) {
+  const hasSubmissions = submissions.length > 0;
+
+  return (
+    <Card className="col-span-4 lg:col-span-4">
+      <CardHeader>
+        <CardTitle className="flex items-center gap-2">
+          <Inbox className="h-4 w-4 text-muted-foreground" />
+          Recent Submissions
+        </CardTitle>
+      </CardHeader>
+      <CardContent>
+        {!hasSubmissions ? (
+           <EmptyState
+             icon={Inbox}
+             title="No New Submissions"
+             description="All caught up! There are no new submissions to review."
+             action={{ label: "View submissions", href: "/teacher/homework/submissions" }}
+             className="border-none h-[300px]"
+           />
+        ) : (
+          <div className="space-y-6">
+            {submissions.map((item) => (
+              <div key={item.id} className="flex items-center justify-between group">
+                <div className="flex items-center space-x-4">
+                  <Avatar className="h-9 w-9">
+                    <AvatarImage src={undefined} alt={item.studentName} />
+                    <AvatarFallback>{item.studentName.charAt(0)}</AvatarFallback>
+                  </Avatar>
+                  <div className="space-y-1">
+                    <p className="text-sm font-medium leading-none">
+                      {item.studentName}
+                    </p>
+                    <p className="text-sm text-muted-foreground">
+                      <Link
+                        href={`/teacher/homework/submissions/${item.id}`}
+                        className="font-medium text-foreground hover:underline"
+                      >
+                        {item.assignmentTitle}
+                      </Link>
+                    </p>
+                  </div>
+                </div>
+                <div className="flex items-center space-x-2">
+                  <div className="text-sm text-muted-foreground">
+                      {item.submittedAt ? formatDate(item.submittedAt) : "-"}
+                  </div>
+                  {item.isLate && (
+                      <span className="inline-flex items-center rounded-full border border-destructive px-2 py-0.5 text-xs font-semibold text-destructive transition-colors focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2">
+                          Late
+                      </span>
+                  )}
+                </div>
+              </div>
+            ))}
+          </div>
+        )}
+      </CardContent>
+    </Card>
+  );
+}