redesigned payment page + a lot of fixes

frontend/pweb/lib/controllers/auth/password_form.dart

@@ -0,0 +1,103 @@
+import 'package:flutter/material.dart';
+
+import 'package:pshared/provider/account.dart';
+import 'package:pshared/api/responses/error/server.dart';
+
+import 'package:pweb/models/state/edit_state.dart';
+import 'package:pweb/models/auth/password_field_type.dart';
+import 'package:pweb/models/state/visibility.dart';
+
+
+class PasswordFormController extends ChangeNotifier {
+  final formKey = GlobalKey<FormState>();
+  final oldPasswordController = TextEditingController();
+  final newPasswordController = TextEditingController();
+  final confirmPasswordController = TextEditingController();
+
+  final Map<PasswordFieldType, VisibilityState> _visibility = {
+    PasswordFieldType.old: VisibilityState.hidden,
+    PasswordFieldType.newPassword: VisibilityState.hidden,
+    PasswordFieldType.confirmPassword: VisibilityState.hidden,
+  };
+  EditState _state = EditState.view;
+  String _errorText = '';
+  bool _disposed = false;
+
+  bool get isExpanded => _state != EditState.view;
+  bool get isSaving => _state == EditState.saving;
+  String get errorText => _errorText;
+  EditState get state => _state;
+  bool isPasswordVisible(PasswordFieldType type) =>
+      _visibility[type] == VisibilityState.visible;
+
+  void toggleExpanded() {
+    if (_state == EditState.saving) return;
+    _setState(_state == EditState.view ? EditState.edit : EditState.view);
+    _setError('');
+  }
+
+  void togglePasswordVisibility(PasswordFieldType type) {
+    final current = _visibility[type];
+    if (current == null) return;
+    _visibility[type] = current == VisibilityState.hidden
+        ? VisibilityState.visible
+        : VisibilityState.hidden;
+    notifyListeners();
+  }
+
+  Future<bool> submit({
+    required AccountProvider accountProvider,
+    required String errorText,
+  }) async {
+    final currentForm = formKey.currentState;
+    if (currentForm == null || !currentForm.validate()) return false;
+
+    _setState(EditState.saving);
+    _setError('');
+
+    try {
+      await accountProvider.changePassword(
+        oldPasswordController.text,
+        newPasswordController.text,
+      );
+
+      oldPasswordController.clear();
+      newPasswordController.clear();
+      confirmPasswordController.clear();
+      _setState(EditState.view);
+      return true;
+    } catch (e) {
+      _setError(_errorMessageForException(e, errorText));
+      _setState(EditState.edit);
+      rethrow;
+    }
+  }
+
+  String _errorMessageForException(Object exception, String fallback) {
+    if (exception is ErrorResponse && exception.details.isNotEmpty) {
+      return exception.details;
+    }
+    return fallback;
+  }
+
+  void _setState(EditState value) {
+    if (_state == value || _disposed) return;
+    _state = value;
+    notifyListeners();
+  }
+
+  void _setError(String value) {
+    if (_disposed) return;
+    _errorText = value;
+    notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    oldPasswordController.dispose();
+    newPasswordController.dispose();
+    confirmPasswordController.dispose();
+    super.dispose();
+  }
+}