feat(v3): restructure project + add complete frontend

- Restructure: move backend from new_project/ to backend/
- Add full React/TypeScript frontend (37 pages, 17 services, 16 type defs, 11 query hooks)
- Add docs/ with SRS specs, user stories, and workflow documentation
- Update .gitignore for new directory layout

Workflows implemented:
  WF1 User Signup, WF2 Placement Test, WF3 Exam Configuration,
  WF4 General English Exam, WF5 Course Generation,
  WF6 Entity Student Onboarding, AI Course Generation,
  Adaptive Learning Engine UI, White-Label Branding, Score Release

Made-with: Cursor

frontend/src/pages/student/StudentAssignments.tsx

@@ -0,0 +1,93 @@
+import { useState } from "react";
+import { Card, CardContent } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { Button } from "@/components/ui/button";
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
+import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter } from "@/components/ui/dialog";
+import { Textarea } from "@/components/ui/textarea";
+import { useAssignments } from "@/hooks/queries";
+import { Upload } from "lucide-react";
+import { useToast } from "@/hooks/use-toast";
+import AiWritingHelper from "@/components/ai/AiWritingHelper";
+import AiTipBanner from "@/components/ai/AiTipBanner";
+
+export default function StudentAssignments() {
+  const [submitOpen, setSubmitOpen] = useState(false);
+  const [selectedAssignment, setSelectedAssignment] = useState<string | null>(null);
+  const [draftText, setDraftText] = useState("");
+  const { toast } = useToast();
+  const { data: assignmentsData, isLoading } = useAssignments();
+  const assignments = assignmentsData?.items ?? [];
+  if (isLoading) return <div className="flex items-center justify-center min-h-[400px]"><div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary" /></div>;
+
+  const handleSubmit = () => {
+    setSubmitOpen(false);
+    toast({ title: "Assignment Submitted", description: "Your work has been submitted successfully." });
+  };
+
+  const statusFilter = (status: string) => assignments.filter(a => status === "all" ? true : a.status === status);
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-2xl font-bold">Assignments</h1>
+        <p className="text-muted-foreground">View and submit your assignments.</p>
+      </div>
+
+      <AiTipBanner context="student-assignments" variant="recommendation" />
+
+      <Tabs defaultValue="all">
+        <TabsList>
+          <TabsTrigger value="all">All ({assignments.length})</TabsTrigger>
+          <TabsTrigger value="pending">Pending ({statusFilter("pending").length})</TabsTrigger>
+          <TabsTrigger value="submitted">Submitted ({statusFilter("submitted").length})</TabsTrigger>
+          <TabsTrigger value="graded">Graded ({statusFilter("graded").length})</TabsTrigger>
+        </TabsList>
+
+        {["all", "pending", "submitted", "graded", "overdue"].map(tab => (
+          <TabsContent key={tab} value={tab} className="mt-4 space-y-3">
+            {statusFilter(tab).map(a => (
+              <Card key={a.id}>
+                <CardContent className="pt-4">
+                  <div className="flex items-center justify-between">
+                    <div className="min-w-0">
+                      <p className="font-medium text-sm">{a.title}</p>
+                      <p className="text-xs text-muted-foreground">{a.courseName} · Due: {a.dueDate}</p>
+                      {a.grade !== undefined && <p className="text-xs font-medium text-primary mt-1">Grade: {a.grade}/{a.maxGrade}</p>}
+                      {a.feedback && <p className="text-xs text-muted-foreground mt-0.5">"{a.feedback}"</p>}
+                    </div>
+                    <div className="flex items-center gap-2 shrink-0">
+                      <Badge variant={a.status === "graded" ? "default" : a.status === "overdue" ? "destructive" : "secondary"}>{a.status}</Badge>
+                      {a.status === "pending" && (
+                        <Button size="sm" onClick={() => { setSelectedAssignment(a.id); setSubmitOpen(true); }}>Submit</Button>
+                      )}
+                    </div>
+                  </div>
+                </CardContent>
+              </Card>
+            ))}
+          </TabsContent>
+        ))}
+      </Tabs>
+
+      <Dialog open={submitOpen} onOpenChange={setSubmitOpen}>
+        <DialogContent>
+          <DialogHeader><DialogTitle>Submit Assignment</DialogTitle></DialogHeader>
+          <div className="space-y-4">
+            <div className="border-2 border-dashed rounded-lg p-8 text-center text-muted-foreground">
+              <Upload className="h-8 w-8 mx-auto mb-2 opacity-50" />
+              <p className="text-sm">Drag & drop your file here or click to browse</p>
+              <p className="text-xs mt-1">PDF, DOC, DOCX up to 10MB</p>
+            </div>
+            <Textarea placeholder="Add a comment (optional)..." rows={3} value={draftText} onChange={(e) => setDraftText(e.target.value)} />
+            <AiWritingHelper text={draftText} task_type="ielts_writing" />
+          </div>
+          <DialogFooter>
+            <Button variant="outline" onClick={() => setSubmitOpen(false)}>Cancel</Button>
+            <Button onClick={handleSubmit}>Submit</Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+    </div>
+  );
+}