add option to disable keybindings

src/Settings/BehaviorSettings/BehaviorSettings.php

@@ -41,4 +41,7 @@ class BehaviorSettings
 
     #[EmbeddedSettings]
     public ?PartInfoSettings $partInfo = null;
+
+    #[EmbeddedSettings]
+    public ?KeybindingsSettings $keybindings = null;
 }

src/Settings/BehaviorSettings/KeybindingsSettings.php

@@ -0,0 +1,47 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2025 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+
+namespace App\Settings\BehaviorSettings;
+
+use App\Settings\SettingsIcon;
+use Jbtronics\SettingsBundle\Metadata\EnvVarMode;
+use Jbtronics\SettingsBundle\Settings\Settings;
+use Jbtronics\SettingsBundle\Settings\SettingsParameter;
+use Symfony\Component\Translation\TranslatableMessage as TM;
+
+#[Settings(name: "keybindings", label: new TM("settings.behavior.keybindings"))]
+#[SettingsIcon('fa-keyboard')]
+class KeybindingsSettings
+{
+    /**
+     * Whether to enable special character keybindings (Alt+key) in text input fields
+     * @var bool
+     */
+    #[SettingsParameter(
+        label: new TM("settings.behavior.keybindings.enable_special_characters"), 
+        description: new TM("settings.behavior.keybindings.enable_special_characters.help"),
+        envVar: "bool:KEYBINDINGS_SPECIAL_CHARS_ENABLED", 
+        envVarMode: EnvVarMode::OVERWRITE
+    )]
+    public bool $enableSpecialCharacters = true;
+}