The UMD bundle inlines lit for a self-contained CDN <script>; inlining lit also
pulls in its runtime deps (@lit/reactive-element, lit-html, lit-element,
@lit-labs/ssr-dom-shim). tsdown flags that transitive bundling as 'unintended'
and promotes the warning to a fatal error under CI, breaking
@copilotkit/web-components:build (and every dependent). Declare all lit packages
in noExternal and set inlineOnly: false to mark the bundling intentional.
Shadow-DOM Lit element that renders the threads drawer: self-contained styles
with build-time token sync from react-core's theme, slot projection for custom
rows, license/upsell gating, filtering, and a mobile modal. View-state lives on
the element; domain state stays with the host. Multi-format build (ESM/CJS
externalize lit as a peer dep; UMD inlines lit so the CDN <script> path is
self-contained).
Benjamin Taylor