feat: add complete EnCoach frontend application

Full React 18 + TypeScript + Vite frontend with:
- 90+ pages (admin, student, teacher, public)
- shadcn/ui component library with 50+ components
- JWT authentication with role-based access control
- TanStack React Query for server state management
- 30+ API service modules
- AI-powered features (coaching, grading, generation)
- Adaptive learning UI (diagnostics, proficiency, plans)
- Institutional LMS management (courses, batches, timetable)
- Communication suite (discussions, announcements, DMs)
- Full CRUD with validation and confirmation dialogs

Made-with: Cursor

src/components/ui/textarea.tsx

@@ -0,0 +1,21 @@
+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+export interface TextareaProps extends React.TextareaHTMLAttributes<HTMLTextAreaElement> {}
+
+const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(({ className, ...props }, ref) => {
+  return (
+    <textarea
+      className={cn(
+        "flex min-h-[80px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+        className,
+      )}
+      ref={ref}
+      {...props}
+    />
+  );
+});
+Textarea.displayName = "Textarea";
+
+export { Textarea };