feat: implement template editing functionality and revert approved templates to draft status

src/Sms/Entity/SmsTemplate.php

@@ -72,6 +72,8 @@ class SmsTemplate
 
     public function submitForReview(): self { $this->status = self::STATUS_PENDING; $this->touch(); return $this; }
 
+    public function revertToDraft(): self { $this->status = self::STATUS_DRAFT; $this->touch(); return $this; }
+
     public function approve(?string $note = null): self
     {
         $this->status    = self::STATUS_APPROVED;