fix: update folder account filtering and set default folder ID for imported accounts

app/folders/page.tsx

@@ -56,7 +56,10 @@ function FolderTreeItem({
 }: FolderTreeItemProps) {
   const [isExpanded, setIsExpanded] = useState(true)
 
-  const folderAccounts = accounts.filter((a) => a.folderId === folder.id)
+  // Pour le dossier racine, inclure aussi les comptes sans dossier (folderId: null)
+  const folderAccounts = accounts.filter((a) => 
+    a.folderId === folder.id || (folder.parentId === null && a.folderId === null)
+  )
   const childFolders = allFolders.filter((f) => f.parentId === folder.id)
   const hasChildren = childFolders.length > 0 || folderAccounts.length > 0
 

components/import/ofx-import-dialog.tsx

@@ -88,7 +88,7 @@ export function OFXImportDialog({ children, onImportComplete }: OFXImportDialogP
           bankId: parsed.bankId,
           accountNumber: parsed.accountId,
           type: parsed.accountType as Account["type"],
-          folderId: null,
+          folderId: "folder-root",
           balance: parsed.balance,
           currency: parsed.currency,
           lastImport: new Date().toISOString(),