Refactor extension files to support updated antd

Summary: Correct spinner issue in extension by duplicating antd refactor of app. Also increases width of extension.

Test Plan:
npm run extension

Navigate to chrome://extensions in Chrome or brave://extensions in Brave

Enable Developer Mode (switch in top right)

Click 'Load Unpacked' extension and selct the /abc/web/cashtab/extension/dist directory

Try the extension in your browser. Verify the menus are clear for Send and Send Token pages at this width.

Reviewers: alcipir, majcosta, #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D8679