Hide help UI when ?post parameter is present

[Copilot]

When the viewer is used with postMessage communication (e.g., embedded in an editor), the help instructions are unnecessary UI clutter.

Changes

• Modified packages/host/src/listener.ts to parse URL parameters and conditionally hide help when ?post is present

// Check URL parameters for file to load
if (!this.options.url || (this.options.url && !checkUrlForFile(this))) {
  show(this.loadingDiv, false);
  // Hide help if URL contains ?post parameter
  const urlParams = new URLSearchParams(window.location.search);
  const hasPostParam = urlParams.has('post');
  show(this.helpDiv, !hasPostParam);
}

Behavior

• https://microsoft.github.io/chartifact/view/ → help visible
• https://microsoft.github.io/chartifact/view/?post → help hidden
• https://microsoft.github.io/chartifact/view/?load=file.md → help hidden (unchanged)

Original prompt

In the host package, hide the help if the url is https://microsoft.github.io/chartifact/view/?post

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