Release v26.2.0

Added

• ng2-pdfjs-viewer/signals: a new entry point that projects viewer state — current
  page, zoom, total pages, search matches, read-aloud progress, annotation-editor
  state, sidebar, metadata, form data, and the view-mode strings — as read-only
  Angular signals. Call pdfViewerSignals(viewer, { injector }) and read
  signals.page(), signals.totalPages(), signals.loaded() in a template, or
  build computed/effect on top. Aimed at zoneless / OnPush apps. Requires
  Angular 16+; the base package's >=10 peer range is unchanged.
• AI assistant streaming: PdfAiAssistant.ask() and complete() take an optional
  onToken callback and stream the answer token-by-token over Server-Sent Events,
  falling back to a single response when the endpoint doesn't stream. The built-in
  chat panel renders the answer as it arrives.

Fixed

• onPagesInit now fires once the document's pages initialize - it carries the
  page count and was declared but never emitted. This is what makes the new
  signals entry point's loaded() and totalPages() populate.