chore(release): react-ui 0.13.0

[ankit-thesys]

react-ui 0.13.0

This release delivers the AgentInterface refresh from #787 to npm. This PR is the version bump only (packages/react-ui 0.12.1 → 0.13.0); there are no code changes here.

What's new in 0.13.0

• Welcome screen, reworked — new glow treatment via the WelcomeGlow component and the optional glowAnimation prop (also available as AgentInterface.WelcomeGlow), staggered entrance, and full prefers-reduced-motion support.
• Thread list & sidebar refinements — a flat "Threads" list, theme-aware sidebar shadows, and better handling of long thread and agent names.
• Artifact browser polish — refreshed loading states, clearer empty-search text, and updated spacing and icon sizing.
• Theme updates — the default brand swatch is now blue, user message bubbles use highlight-strong, and generated theme variables have been refreshed for both color schemes.

Breaking change

• MessageLoading has been removed from the public API; built-in surfaces now use an internal loading indicator. If you imported MessageLoading, render your own instead — @openuidev/react-headless provides the state you need:

  const isRunning = useThread((s) => s.isRunning);
  return isRunning ? <MyLoader /> : null;

Because 0.x minors carry breaking changes, this ships as 0.13.0 rather than a patch.

Not exported (yet)

You may notice DotMatrixLoader and ConversationStarter in the source; they are intentionally internal for now. ConversationStarter is planned to surface later as AgentInterface.ConversationStarter. Custom loaders and starter chips are fully supported today through @openuidev/react-headless hooks.

Publishing

After merge, the package is published with the standard prepublish gates (check:css, publint, attw). The open PRs #721 and #737 may ride along in this release if reviewed in time, in which case this PR rebases over them first.