Method setSearchHighlight

src/ink/ink.tsx:1055–1059

* Set the search highlight query. Non-empty → all visible occurrences * are inverted (SGR 7) on the next frame; first one also underlined. * Empty → clears (prevFrameContaminated handles the frame after). Same * damage-tracking machinery as selection — setCellStyleId doesn't track * dama

(query: string)

   * damage, so the overlay forces full-frame damage while active.
   */
  setSearchHighlight(query: string): void {
    if (this.searchHighlightQuery === query) return;
    this.searchHighlightQuery = query;
    this.scheduleRender();
  }

  /** Paint an EXISTING DOM subtree to a fresh Screen at its natural
   *  height, scan for query. Returns positions relative to the element's