fix: Address remaining CI failures (psalm type hint, AttendeeMapper warning)

- Add psalm type annotation for json_decode result in ConversationCategoryMapper
- Handle missing category_ids key in AttendeeMapper::createAttendeeFromRow

Signed-off-by: Rikdekker <Rikdekker@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Rikdekker

lib/Model/AttendeeMapper.php

@@ -311,7 +311,7 @@ public function createAttendeeFromRow(array $row): Attendee {
 			'archived' => (bool)$row['archived'],
 			'important' => (bool)$row['important'],
 			'sensitive' => (bool)$row['sensitive'],
-			'category_ids' => $row['category_ids'],
+			'category_ids' => $row['category_ids'] ?? null,
 			'has_unread_threads' => (bool)$row['has_unread_threads'],
 			'has_unread_thread_mentions' => (bool)$row['has_unread_thread_mentions'],
 			'has_unread_thread_directs' => (bool)$row['has_unread_thread_directs'],

lib/Model/ConversationCategoryMapper.php

@@ -73,6 +73,7 @@ public function clearCategoryFromAttendees(int|string $categoryId, string $userI
 
 		$result = $qb->executeQuery();
 		while ($row = $result->fetch()) {
+			/** @var list<string|int> $categoryIds */
 			$categoryIds = json_decode($row['category_ids'], true) ?? [];
 			$categoryIds = array_values(array_filter($categoryIds, fn ($id) => (string)$id !== $categoryIdStr));