feat: add dashboard, projects, and persons pages with reusable components

Implemented the following:
- `DashboardPage`: displays an overview of stats, recent projects, and tabs for future analytics/reports.
- `ProjectsPage` and `PersonsPage`: include searchable tables, actions, and mobile-friendly card views.
- Integrated reusable components like `AuthLoading`, `DropdownMenu`, `Table`, and `Card`.

frontend/app/projects/new/page.tsx

@@ -0,0 +1,134 @@
+"use client";
+
+import { useState } from "react";
+import { useRouter } from "next/navigation";
+import Link from "next/link";
+import { useForm } from "react-hook-form";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from "@/components/ui/card";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Textarea } from "@/components/ui/textarea";
+import { 
+  ArrowLeft,
+  Loader2,
+  Save
+} from "lucide-react";
+import { toast } from "sonner";
+
+// Type definitions
+interface ProjectFormData {
+  name: string;
+  description: string;
+}
+
+export default function NewProjectPage() {
+  const router = useRouter();
+  const [isSubmitting, setIsSubmitting] = useState(false);
+  
+  const { register, handleSubmit, formState: { errors } } = useForm<ProjectFormData>({
+    defaultValues: {
+      name: "",
+      description: ""
+    }
+  });
+
+  const onSubmit = async (data: ProjectFormData) => {
+    setIsSubmitting(true);
+    try {
+      // In a real app, this would be an API call to create a new project
+      await new Promise(resolve => setTimeout(resolve, 1000));
+      
+      // Simulate a successful response with a project ID
+      const projectId = Date.now();
+      
+      toast.success("Projet créé avec succès");
+      router.push(`/projects/${projectId}`);
+    } catch (error) {
+      console.error("Error creating project:", error);
+      toast.error("Erreur lors de la création du projet");
+    } finally {
+      setIsSubmitting(false);
+    }
+  };
+
+  return (
+    <div className="flex flex-col gap-6">
+      <div className="flex items-center gap-2">
+        <Button variant="outline" size="icon" asChild>
+          <Link href="/projects">
+            <ArrowLeft className="h-4 w-4" />
+          </Link>
+        </Button>
+        <h1 className="text-3xl font-bold">Nouveau projet</h1>
+      </div>
+
+      <Card>
+        <form onSubmit={handleSubmit(onSubmit)}>
+          <CardHeader>
+            <CardTitle>Informations du projet</CardTitle>
+            <CardDescription>
+              Créez un nouveau projet pour organiser vos groupes
+            </CardDescription>
+          </CardHeader>
+          <CardContent className="space-y-4">
+            <div className="space-y-2">
+              <Label htmlFor="name">Nom du projet</Label>
+              <Input
+                id="name"
+                placeholder="Ex: Formation Développement Web"
+                {...register("name", { 
+                  required: "Le nom du projet est requis",
+                  minLength: {
+                    value: 3,
+                    message: "Le nom doit contenir au moins 3 caractères"
+                  }
+                })}
+              />
+              {errors.name && (
+                <p className="text-sm text-destructive">{errors.name.message}</p>
+              )}
+            </div>
+
+            <div className="space-y-2">
+              <Label htmlFor="description">Description</Label>
+              <Textarea
+                id="description"
+                placeholder="Décrivez votre projet..."
+                rows={4}
+                {...register("description", { 
+                  required: "La description du projet est requise",
+                  minLength: {
+                    value: 10,
+                    message: "La description doit contenir au moins 10 caractères"
+                  }
+                })}
+              />
+              {errors.description && (
+                <p className="text-sm text-destructive">{errors.description.message}</p>
+              )}
+            </div>
+          </CardContent>
+          <CardFooter className="flex justify-between">
+            <Button variant="outline" asChild>
+              <Link href="/projects">Annuler</Link>
+            </Button>
+            <Button type="submit" disabled={isSubmitting}>
+              {isSubmitting ? (
+                <>
+                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+                  Création en cours...
+                </>
+              ) : (
+                <>
+                  <Save className="mr-2 h-4 w-4" />
+                  Créer le projet
+                </>
+              )}
+            </Button>
+          </CardFooter>
+        </form>
+      </Card>
+    </div>
+  );
+}