test: migrate to vitest (jest->vi codemod, enzyme harness); 80/96 files green

- vitest.setup.js: enzyme-adapter-react-16, enzyme-to-json serializer, rAF/
  matchMedia polyfills, automocks (electron/fs/electron-log/redux-logger/uuid)
- codemod jest.* -> vi.* across all test files and __mocks__
- install jsdom; pin cheerio 1.0.0-rc.3 override (enzyme 3 needs lib/utils subpath)
14 files still failing (done()-callbacks, ESM export reassignment, vi.mock default
keys, obsolete snapshots) — fixed next.

Author: jthrilly

__mocks__/electron.js

@@ -1,13 +1,13 @@
 /* eslint-env jest */
 
 const dialog = {
-  showMessageBox: jest.fn().mockImplementation(() => Promise.resolve('response')),
-  showOpenDialog: jest.fn().mockImplementation(() => Promise.resolve('response')),
+  showMessageBox: vi.fn().mockImplementation(() => Promise.resolve('response')),
+  showOpenDialog: vi.fn().mockImplementation(() => Promise.resolve('response')),
 };
 
 const app = {
-  getVersion: jest.fn(() => '0.0.0'),
-  getPath: jest.fn(() => '/dev/null/get/electron/path'),
+  getVersion: vi.fn(() => '0.0.0'),
+  getPath: vi.fn(() => '/dev/null/get/electron/path'),
 };
 
 module.exports = {