feat: enhance RTextField by adding isFullHeight property for improved vertical layout control

packages/core/lib/presentation/widget/inputs/r_input.dart

@@ -23,6 +23,7 @@ class RTextField extends StatefulWidget {
   final BoxConstraints? boxConstraints;
   final RTextFieldVariant variant;
   final bool filled;
+  final bool isFullHeight;
   final Color? filledColor;
   final Color? borderColor;
   final bool showCounter;
@@ -92,6 +93,7 @@ class RTextField extends StatefulWidget {
     this.prefixIcon,
     this.suffix,
     this.boxConstraints,
+    this.isFullHeight = false,
 
     // 📐 Layout & appearance
     this.borderColor,
@@ -231,10 +233,10 @@ class _RTextFieldState extends State<RTextField> {
           decoration: InputDecoration(
             contentPadding: EdgeInsets.symmetric(
               horizontal: 16,
-              vertical: widget.height / 3,
+              vertical: widget.isFullHeight ? widget.height / 3 : 0,
             ),
-            errorStyle: widget.errorStyle,
 
+            errorStyle: widget.errorStyle,
             errorMaxLines: 1,
             isDense: widget.isDense,
             suffix: widget.suffix,