fix data flow issues

apps/website/lib/command-models/auth/SignupCommandModel.ts

@@ -0,0 +1,89 @@
+export interface SignupFormData {
+  displayName: string;
+  email: string;
+  password: string;
+  confirmPassword: string;
+}
+
+export interface SignupValidationErrors {
+  displayName?: string;
+  email?: string;
+  password?: string;
+  confirmPassword?: string;
+}
+
+/**
+ * SignupCommandModel
+ *
+ * Encapsulates signup form state, client-side validation, and
+ * prepares data for submission to the AuthService.
+ */
+export class SignupCommandModel {
+  private _displayName: string;
+  private _email: string;
+  private _password: string;
+  private _confirmPassword: string;
+
+  constructor(initial: SignupFormData) {
+    this._displayName = initial.displayName;
+    this._email = initial.email;
+    this._password = initial.password;
+    this._confirmPassword = initial.confirmPassword;
+  }
+
+  get displayName(): string {
+    return this._displayName;
+  }
+
+  get email(): string {
+    return this._email;
+  }
+
+  get password(): string {
+    return this._password;
+  }
+
+  get confirmPassword(): string {
+    return this._confirmPassword;
+  }
+
+  /** Basic client-side validation for signup form */
+  validate(): SignupValidationErrors {
+    const errors: SignupValidationErrors = {};
+
+    if (!this._displayName.trim()) {
+      errors.displayName = 'Display name is required';
+    } else if (this._displayName.trim().length < 3) {
+      errors.displayName = 'Display name must be at least 3 characters';
+    }
+
+    if (!this._email.trim()) {
+      errors.email = 'Email is required';
+    } else if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(this._email)) {
+      errors.email = 'Invalid email format';
+    }
+
+    if (!this._password) {
+      errors.password = 'Password is required';
+    } else if (this._password.length < 8) {
+      errors.password = 'Password must be at least 8 characters';
+    }
+
+    if (!this._confirmPassword) {
+      errors.confirmPassword = 'Please confirm your password';
+    } else if (this._password !== this._confirmPassword) {
+      errors.confirmPassword = 'Passwords do not match';
+    }
+
+    return errors;
+  }
+
+  /** Convert to API SignupParams DTO */
+  toRequestDto(): { email: string; password: string; displayName: string } {
+    return {
+      email: this._email,
+      password: this._password,
+      displayName: this._displayName,
+    };
+  }
+}