Restructuration majeure du projet: migration de flutt vers app, ajout de l'API et mise à jour du site web

app/lib/presentation/widgets/custom_button.dart

@@ -0,0 +1,71 @@
+import 'package:flutter/material.dart';
+
+class CustomButton extends StatelessWidget {
+  final VoidCallback? onPressed;
+  final String text;
+  final IconData? icon;
+  final bool isLoading;
+  final double? width;
+  final Color? backgroundColor;
+  final Color? textColor;
+
+  const CustomButton({
+    super.key,
+    required this.onPressed,
+    required this.text,
+    this.icon,
+    this.isLoading = false,
+    this.width,
+    this.backgroundColor,
+    this.textColor,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    
+    return SizedBox(
+      width: width,
+      child: ElevatedButton(
+        onPressed: isLoading ? null : onPressed,
+        style: ElevatedButton.styleFrom(
+          backgroundColor: backgroundColor ?? theme.colorScheme.primary,
+          foregroundColor: textColor ?? Colors.white,
+          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(12),
+          ),
+          elevation: 2,
+        ),
+        child: isLoading
+            ? SizedBox(
+                height: 20,
+                width: 20,
+                child: CircularProgressIndicator(
+                  strokeWidth: 2,
+                  valueColor: AlwaysStoppedAnimation<Color>(
+                    textColor ?? Colors.white,
+                  ),
+                ),
+              )
+            : Row(
+                mainAxisSize: MainAxisSize.min,
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: [
+                  if (icon != null) ...[
+                    Icon(icon),
+                    const SizedBox(width: 8),
+                  ],
+                  Text(
+                    text,
+                    style: const TextStyle(
+                      fontWeight: FontWeight.bold,
+                      fontSize: 16,
+                    ),
+                  ),
+                ],
+              ),
+      ),
+    );
+  }
+}