fix: convert Jest configs to ES module syntax

Convert jest.config.ts and swcjest.config.ts from CommonJS to ES module
syntax to fix 'module is not defined in ES module scope' error.

The issue occurred because package.json has "type": "module" which makes
Node.js treat .ts files as ES modules, but Jest configs were using
module.exports (CommonJS syntax).

Co-authored-by: Ivan Galiatin <[email protected]>

Author: claude[bot]

jest.config.ts

@@ -1,5 +1,5 @@
 /** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
-module.exports = {
+export default {
   preset: 'ts-jest',
   testEnvironment: 'jsdom',
   setupFilesAfterEnv: ['<rootDir>/jest-setup.ts'],

swcjest.config.ts

@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   testEnvironment: 'jsdom',
   transform: {
     '^.+\\.(t|j)sx?$': '@swc/jest',