Themes
Displays the Theme Showcase, which resides on /themes and handles multi-site, single-site and Jetpack-site views.
theme-options.js
Contains definitions for individual Theme options ('Activate', 'Customize' etc).
main.jsx
The main parent component for the Themes module.
thanks-modal.jsx
The post-activation 'Thanks' dialog.
helpers.js
Contains helper functions.
theme-search-card
The search bar for the Showcase.
themes-selection.jsx
A large component that composes the search box, and the displayed list of themes below.