Always extract the full caption via Playwright (browser sees the
untruncated text). yt-dlp runs in parallel only to get the thumbnail
CDN URL quickly; its result for the description is discarded.
This eliminates the truncation problem at the source without needing
a fallback heuristic.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
