fix(ui): broken buttons in the bulk upload drawer (#8926)

Fixes the mobile bottom interface and the arrow buttons in the actions
at the top.

Before:

![image](https://github.com/user-attachments/assets/26902eb0-5d1a-480d-b6f5-c36a800a6bff)


After:

![image](https://github.com/user-attachments/assets/7837684c-37a7-4b2e-a875-47972cf1671f)

packages/ui/src/elements/BulkUpload/FileSidebar/index.tsx

@@ -98,6 +98,14 @@ export function FileSidebar() {
               className={`${baseClass}__toggler`}
               onClick={() => setShowFiles((prev) => !prev)}
             >
+              <span className={`${baseClass}__toggler__label`}>
+                <strong
+                  title={`${totalFileCount} ${t(totalFileCount > 1 ? 'upload:filesToUpload' : 'upload:fileToUpload')}`}
+                >
+                  {totalFileCount}{' '}
+                  {t(totalFileCount > 1 ? 'upload:filesToUpload' : 'upload:fileToUpload')}
+                </strong>
+              </span>
               <ChevronIcon direction={showFiles ? 'down' : 'up'} />
             </Button>