feat: refactor participant card DTOs and labels

src/Form/Model/ParticipantCardDataDto.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Model;
+
+/**
+ * Typed participant card payload for create/edit overview rendering.
+ */
+final class ParticipantCardDataDto
+{
+    /**
+     * @param array<string> $errorMessages
+     */
+    public function __construct(
+        public readonly string $name,
+        public readonly string $email,
+        public readonly string $roomName,
+        public readonly ParticipantCardPriceDto $price,
+        public readonly bool $isCanceled,
+        public readonly bool $isValid = true,
+        public readonly array $errorMessages = [],
+    ) {
+    }
+
+    /**
+     * Returns a copy with validation state applied.
+     *
+     * @param array<string> $errorMessages
+     */
+    public function withValidation(bool $isValid, array $errorMessages): self
+    {
+        return new self(
+            name: $this->name,
+            email: $this->email,
+            roomName: $this->roomName,
+            price: $this->price,
+            isCanceled: $this->isCanceled,
+            isValid: $isValid,
+            errorMessages: $errorMessages,
+        );
+    }
+}

src/Form/Model/ParticipantCardPriceDto.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Model;
+
+/**
+ * Typed price display state for a participant card.
+ */
+final class ParticipantCardPriceDto
+{
+    public function __construct(
+        public readonly ?float $amount,
+        public readonly bool $showDash,
+    ) {
+    }
+}