Add custom upload confirmation and flatten folder uploads to individual files.

Users confirm uploads in a Ladill modal before transfer, and folder picks upload flat file names into the current location instead of preserving local directory paths.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Services/Transfer/FileStorageService.php

@@ -126,7 +126,7 @@ class FileStorageService
                     throw new RuntimeException($file->getClientOriginalName().' exceeds the maximum file size.');
                 }
 
-                $originalName = $file->getClientOriginalName() ?: 'file';
+                $originalName = $this->basenameFilename($file->getClientOriginalName() ?: 'file');
                 $resolution = $resolutions[$originalName] ?? null;
 
                 if ($resolution === 'replace') {
@@ -193,4 +193,12 @@ class FileStorageService
 
         return $candidate;
     }
+
+    private function basenameFilename(string $filename): string
+    {
+        $normalized = str_replace('\\', '/', trim($filename));
+        $base = basename($normalized);
+
+        return $base !== '' ? $base : 'file';
+    }
 }