[BUGFIX] Prevent TypeError in CreateRecordReactionTable

The `items` array in an itemsProcFunc does no
longer contain item arrays but SelectItem objects.
Therefore, the corresponding type hint is changed
in CreateRecordReactionTable and the code usages
are adjusted to prevent a TypeError.

Resolves: #100242
Related: #99739
Releases: main
Change-Id: I05be3bd33a816a6f957032d1482c37b3c33cbf9d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78205
Reviewed-by: Frank Nägler <frank.naegler@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.com>

typo3/sysext/reactions/Classes/Form/ReactionItemsProcFunc.php

@@ -32,7 +32,7 @@ class ReactionItemsProcFunc
     public function validateAllowedTablesForExternalCreation(array &$fieldDefinition): void
     {
         foreach ($fieldDefinition['items'] as $key => $item) {
-            if (!CreateRecordReactionTable::fromProcFuncItem($item)->isAllowedForItemsProcFunc()) {
+            if (!CreateRecordReactionTable::fromSelectItem($item)->isAllowedForItemsProcFunc()) {
                 unset($fieldDefinition['items'][$key]);
             }
         }

typo3/sysext/reactions/Classes/Validation/CreateRecordReactionTable.php

@@ -17,6 +17,8 @@
 
 namespace TYPO3\CMS\Reactions\Validation;
 
+use TYPO3\CMS\Core\Schema\Struct\SelectItem;
+
 /**
  * Validation class for tables to be allowed for record creation in the "create record" reaction
  *
@@ -28,9 +30,9 @@ public function __construct(private readonly string $table)
     {
     }
 
-    public static function fromProcFuncItem(array $procFuncItem): CreateRecordReactionTable
+    public static function fromSelectItem(SelectItem $selectItem): CreateRecordReactionTable
     {
-        return new self((string)($procFuncItem[1] ?? ''));
+        return new self((string)$selectItem->getValue());
     }
 
     public function isAllowedForCreation(): bool