redesigned payment page + a lot of fixes

frontend/pweb/lib/pages/payout_page/send/widgets/section/card.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+
+import 'package:pweb/utils/dimensions.dart';
+
+
+class PaymentSectionCard extends StatelessWidget {
+  final Widget child;
+  final EdgeInsetsGeometry? padding;
+
+  const PaymentSectionCard({
+    super.key,
+    required this.child,
+    this.padding,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final dimensions = AppDimensions();
+    final theme = Theme.of(context);
+
+    return Material(
+      elevation: dimensions.elevationSmall,
+      borderRadius: BorderRadius.circular(dimensions.borderRadiusMedium),
+      color: theme.colorScheme.onSecondary,
+      clipBehavior: Clip.antiAlias,
+      child: Padding(
+        padding: padding ?? EdgeInsets.all(dimensions.paddingLarge),
+        child: child,
+      ),
+    );
+  }
+}

frontend/pweb/lib/pages/payout_page/send/widgets/section/title.dart

@@ -0,0 +1,16 @@
+import 'package:flutter/material.dart';
+
+
+class SectionTitle extends StatelessWidget {
+  final String title;
+
+  const SectionTitle(this.title, {super.key});
+
+  @override
+  Widget build(BuildContext context) => Text(
+    title,
+    style: Theme.of(context).textTheme.titleMedium?.copyWith(
+      fontWeight: FontWeight.w600,
+    ),
+  );
+}