feat(imports): import history and delete by import

Track imports in DB, show history in Data section, allow deleting
transactions of a specific import instead of clearing all.

frontend/src/api/import.ts

@@ -1,4 +1,7 @@
-import type { ImportStatementResponse } from '@family-budget/shared';
+import type {
+  ImportStatementResponse,
+  Import,
+} from '@family-budget/shared';
 import { api } from './client';
 
 export async function importStatement(
@@ -11,3 +14,13 @@ export async function importStatement(
     formData,
   );
 }
+
+export async function getImports(): Promise<Import[]> {
+  return api.get<Import[]>('/api/imports');
+}
+
+export async function deleteImport(
+  id: number,
+): Promise<{ deleted: number }> {
+  return api.delete<{ deleted: number }>(`/api/imports/${id}`);
+}

frontend/src/components/DataSection.tsx

@@ -1,13 +1,87 @@
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { ClearHistoryModal } from './ClearHistoryModal';
+import { DeleteImportModal } from './DeleteImportModal';
+import { getImports } from '../api/import';
+import type { Import } from '@family-budget/shared';
+
+function formatDate(iso: string): string {
+  const d = new Date(iso);
+  return d.toLocaleString('ru-RU', {
+    day: '2-digit',
+    month: '2-digit',
+    year: 'numeric',
+    hour: '2-digit',
+    minute: '2-digit',
+  });
+}
 
 export function DataSection() {
   const [showClearModal, setShowClearModal] = useState(false);
+  const [imports, setImports] = useState<Import[]>([]);
+  const [impToDelete, setImpToDelete] = useState<Import | null>(null);
   const navigate = useNavigate();
 
+  useEffect(() => {
+    getImports().then(setImports).catch(() => {});
+  }, []);
+
+  const handleImportDeleted = () => {
+    setImpToDelete(null);
+    getImports().then(setImports).catch(() => {});
+    navigate('/history');
+  };
+
   return (
     <div className="data-section">
+      <div className="section-block">
+        <h3>История импортов</h3>
+        <p className="section-desc">
+          Список импортов выписок. Можно удалить операции конкретного импорта.
+        </p>
+        {imports.length === 0 ? (
+          <p className="muted">Импортов пока нет.</p>
+        ) : (
+          <div className="table-responsive">
+            <table className="table">
+              <thead>
+                <tr>
+                  <th>Дата</th>
+                  <th>Счёт</th>
+                  <th>Банк</th>
+                  <th>Импортировано</th>
+                  <th>Дубликаты</th>
+                  <th></th>
+                </tr>
+              </thead>
+              <tbody>
+                {imports.map((imp) => (
+                  <tr key={imp.id}>
+                    <td>{formatDate(imp.importedAt)}</td>
+                    <td>
+                      {imp.accountAlias || imp.accountNumberMasked || '—'}
+                    </td>
+                    <td>{imp.bank}</td>
+                    <td>{imp.importedCount}</td>
+                    <td>{imp.duplicatesSkipped}</td>
+                    <td>
+                      <button
+                        type="button"
+                        className="btn btn-sm btn-danger"
+                        onClick={() => setImpToDelete(imp)}
+                        disabled={imp.importedCount === 0}
+                      >
+                        Удалить
+                      </button>
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        )}
+      </div>
+
       <div className="section-block">
         <h3>Очистка данных</h3>
         <p className="section-desc">
@@ -32,6 +106,14 @@ export function DataSection() {
           }}
         />
       )}
+
+      {impToDelete && (
+        <DeleteImportModal
+          imp={impToDelete}
+          onClose={() => setImpToDelete(null)}
+          onDone={handleImportDeleted}
+        />
+      )}
     </div>
   );
 }

frontend/src/components/DeleteImportModal.tsx

@@ -0,0 +1,70 @@
+import { useState } from 'react';
+import { deleteImport } from '../api/import';
+import type { Import } from '@family-budget/shared';
+
+interface Props {
+  imp: Import;
+  onClose: () => void;
+  onDone: () => void;
+}
+
+export function DeleteImportModal({ imp, onClose, onDone }: Props) {
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState('');
+
+  const accountLabel =
+    imp.accountAlias || imp.accountNumberMasked || `ID ${imp.accountId}`;
+
+  const handleConfirm = async () => {
+    setLoading(true);
+    setError('');
+    try {
+      await deleteImport(imp.id);
+      onDone();
+    } catch (e) {
+      setError(
+        e instanceof Error ? e.message : 'Ошибка при удалении импорта',
+      );
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="modal-overlay" onClick={onClose}>
+      <div className="modal" onClick={(e) => e.stopPropagation()}>
+        <div className="modal-header">
+          <h2>Удалить импорт</h2>
+          <button className="btn-close" onClick={onClose}>
+            &times;
+          </button>
+        </div>
+
+        <div className="modal-body">
+          <p className="clear-history-warn">
+            Будут удалены все операции этого импорта ({imp.importedCount}{' '}
+            шт.): {imp.bank} / {accountLabel}
+          </p>
+
+          {error && <div className="alert alert-error">{error}</div>}
+
+          <p>Действие необратимо.</p>
+        </div>
+
+        <div className="modal-footer">
+          <button
+            type="button"
+            className="btn btn-danger"
+            onClick={handleConfirm}
+            disabled={loading}
+          >
+            {loading ? 'Удаление…' : 'Удалить'}
+          </button>
+          <button type="button" className="btn btn-secondary" onClick={onClose}>
+            Отмена
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+}