Add Files page upload flow with manual folders and duplicate handling.

Users can create folders, upload files or folders, and choose replace or keep both on name conflicts instead of auto-grouping by transfer.

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

database/migrations/2026_06_08_220000_add_storage_flags_to_transfers.php

@@ -0,0 +1,27 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('transfers', function (Blueprint $table) {
+            $table->boolean('is_folder')->default(false)->after('status');
+            $table->boolean('is_root_storage')->default(false)->after('is_folder');
+            $table->index(['user_id', 'is_folder']);
+            $table->index(['user_id', 'is_root_storage']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('transfers', function (Blueprint $table) {
+            $table->dropIndex(['user_id', 'is_folder']);
+            $table->dropIndex(['user_id', 'is_root_storage']);
+            $table->dropColumn(['is_folder', 'is_root_storage']);
+        });
+    }
+};