Merge develop (squash): login mobile, formulaire sous slogan par ratio

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/lib/widgets/custom_app_text_field.dart

@@ -25,11 +25,13 @@ class CustomAppTextField extends StatefulWidget {
   final IconData? suffixIcon;
   final double labelFontSize;
   final double inputFontSize;
+  final bool showLabel;
 
   const CustomAppTextField({
     super.key,
     required this.controller,
     required this.labelText,
+    this.showLabel = true,
     this.hintText = '',
     this.fieldWidth = 300.0,
     this.fieldHeight = 53.0,
@@ -73,15 +75,17 @@ class _CustomAppTextFieldState extends State<CustomAppTextField> {
       crossAxisAlignment: CrossAxisAlignment.start,
       mainAxisSize: MainAxisSize.min,
       children: [
-        Text(
-          widget.labelText,
-          style: GoogleFonts.merienda(
-            fontSize: widget.labelFontSize,
-            color: Colors.black87,
-            fontWeight: FontWeight.w500,
+        if (widget.showLabel) ...[
+          Text(
+            widget.labelText,
+            style: GoogleFonts.merienda(
+              fontSize: widget.labelFontSize,
+              color: Colors.black87,
+              fontWeight: FontWeight.w500,
+            ),
           ),
-        ),
-        const SizedBox(height: 6), 
+          const SizedBox(height: 6),
+        ],
         SizedBox(
           width: widget.fieldWidth,
           height: dynamicFieldHeight,