fix: use seen insstead of read flag

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

lib/Providers/Mail/Service.php

@@ -641,7 +641,16 @@ class Service implements ServiceBaseInterface, ServiceMutableInterface, ServiceC
         $patch = $this->mailService->entityFresh();
         $flags = $properties->getFlags();
         foreach ($flags as $flag => $value) {
-			$patch->keyword($flag, $value);
+			// translate canonical flag names to JMAP keywords
+			$keyword = match($flag) {
+				'seen' => '$seen',
+				'flagged' => '$flagged',
+				'answered' => '$answered',
+				'draft' => '$draft',
+				'deleted' => '$deleted',
+				default => $flag
+			};
+			$patch->keyword($keyword, $value);
 		}
 
         $dispositions = $this->mailService->entityPatch($patch, ...array_keys($targets));