feat(login): ✨ Ajoutdes champs de formulaire et du bouton de connexion - Images field_email, field_password et btn_green

frontend/lib/screens/auth/login_screen.dart

@@ -51,9 +51,42 @@ class LoginPage extends StatelessWidget {
                         fit: BoxFit.contain,
                       ),
                     ),
-                    // Contenu
-                    const Center(
-                      child: Text('Formulaire de connexion à implémenter'),
+                    // Formulaire
+                    Positioned(
+                      left: leftMargin + imageWidth + (remainingWidth - leftMargin) / 2 - 200,
+                      top: h * 0.3,
+                      child: Column(
+                        mainAxisSize: MainAxisSize.min,
+                        children: [
+                          // Champ email
+                          _ImageTextField(
+                            bg: 'assets/images/field_email.png',
+                            width: 400,
+                            height: 80,
+                            hint: 'Email',
+                          ),
+                          const SizedBox(height: 20),
+                          // Champ mot de passe
+                          _ImageTextField(
+                            bg: 'assets/images/field_password.png',
+                            width: 400,
+                            height: 80,
+                            hint: 'Mot de passe',
+                            obscure: true,
+                          ),
+                          const SizedBox(height: 30),
+                          // Bouton de connexion
+                          _ImageButton(
+                            bg: 'assets/images/btn_green.png',
+                            width: 400,
+                            height: 80,
+                            text: 'Se connecter',
+                            onPressed: () {
+                              // TODO: Implémenter la logique de connexion
+                            },
+                          ),
+                        ],
+                      ),
                     ),
                   ],
                 );
@@ -137,4 +170,50 @@ class _ImageTextField extends StatelessWidget {
       ),
     );
   }
+}
+
+// ───────────────────────────────────────────────────────────────
+// Bouton avec fond image
+// ───────────────────────────────────────────────────────────────
+class _ImageButton extends StatelessWidget {
+  final String bg;
+  final double width;
+  final double height;
+  final String text;
+  final VoidCallback onPressed;
+  const _ImageButton({
+    required this.bg,
+    required this.width,
+    required this.height,
+    required this.text,
+    required this.onPressed,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return SizedBox(
+      width: width,
+      height: height,
+      child: Material(
+        color: Colors.transparent,
+        child: InkWell(
+          onTap: onPressed,
+          child: Stack(
+            children: [
+              Positioned.fill(child: Image.asset(bg, fit: BoxFit.fill)),
+              Center(
+                child: Text(
+                  text,
+                  style: GoogleFonts.merienda(
+                    fontSize: width * 0.045,
+                    color: Colors.white,
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
 } 

frontend/pubspec.yaml

@@ -28,6 +28,9 @@ flutter:
     - assets/images/logo.png
     - assets/images/river_logo_desktop.png
     - assets/images/paper2.png
+    - assets/images/field_email.png
+    - assets/images/field_password.png
+    - assets/images/btn_green.png
     
   fonts:
     - family: Merienda