Separate share transfers from Files storage and add folder upload to New transfer.

Transfers lists only intentional shares while Files shows all storage, and New transfer accepts folder picks with flattened file uploads.

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

app/Http/Controllers/Transfer/TransferController.php

@@ -34,6 +34,7 @@ class TransferController extends Controller
 
         $transfers = Transfer::query()
             ->where('user_id', $account->id)
+            ->shareTransfers()
             ->where('status', '!=', Transfer::STATUS_DELETED)
             ->when($search !== '', function ($query) use ($search) {
                 $like = '%'.$search.'%';
@@ -207,5 +208,6 @@ class TransferController extends Controller
     private function authorizeTransfer(Transfer $transfer): void
     {
         abort_unless($transfer->user_id === ladill_account()->id, 403);
+        abort_if($transfer->isStorageContainer(), 404);
     }
 }