feat: add attachment position setting in email settings

- Introduced a new setting for attachment position in email settings, allowing users to choose between displaying attachments beside the sender or below the header.
- Updated the settings store to include the new attachment position type and default value.
- Added translations for the new setting in multiple languages (de, en, es, fr, it, ja, nl, pt).

components/settings/email-settings.tsx

@@ -24,6 +24,7 @@ export function EmailSettings() {
     emailsPerPage,
     externalContentPolicy,
     mailAttachmentAction,
+    attachmentPosition,
     emailAlwaysLightMode,
     archiveMode,
     trustedSenders,
@@ -195,6 +196,17 @@ export function EmailSettings() {
         />
       </SettingItem>
 
+      <SettingItem label={t('attachment_position.label')} description={t('attachment_position.description')}>
+        <Select
+          value={attachmentPosition}
+          onChange={(value) => updateSetting('attachmentPosition', value as 'beside-sender' | 'below-header')}
+          options={[
+            { value: 'beside-sender', label: t('attachment_position.beside-sender') },
+            { value: 'below-header', label: t('attachment_position.below-header') },
+          ]}
+        />
+      </SettingItem>
+
       {/* Emails Per Page */}
       <SettingItem label={t('emails_per_page.label')} description={t('emails_per_page.description')}>
         <Select