Preserve QPowerPoint hidden slides in PPTX

src/features/qpowerpoint/QPowerPoint.tsx

@@ -1,6 +1,6 @@
 import { useRef, useState } from "react";
 import type { CSSProperties } from "react";
-import { Copy, Download, FileText, FileUp, Image as ImageIcon, Palette, Plus, Save, Trash2 } from "lucide-react";
+import { Copy, Download, EyeOff, FileText, FileUp, Image as ImageIcon, Palette, Plus, Save, Trash2 } from "lucide-react";
 import type { Slide, SlideDeck, SlideImage } from "../../types";
 import { downloadBlobFile, downloadTextFile } from "../../utils/download";
 import { exportPptxBlob, importPptxFile } from "../../io/powerPointOffice";
@@ -315,11 +315,17 @@ export function QPowerPoint({ deck, onChange }: QPowerPointProps) {
           <button
             type="button"
             key={slide.id}
-            className={`slide-thumb theme-${slide.theme} ${slide.id === activeSlide.id ? "is-active" : ""}`}
+            className={`slide-thumb theme-${slide.theme} ${slide.id === activeSlide.id ? "is-active" : ""} ${slide.hidden ? "is-hidden" : ""}`}
             onClick={() => onChange({ ...deck, activeSlideId: slide.id })}
           >
             <span>{index + 1}</span>
             <strong>{slide.title}</strong>
+            {slide.hidden ? (
+              <span className="slide-hidden-badge">
+                <EyeOff size={14} />
+                Скрыт
+              </span>
+            ) : null}
           </button>
         ))}
       </aside>
@@ -417,6 +423,18 @@ export function QPowerPoint({ deck, onChange }: QPowerPointProps) {
       <aside className="inspector" aria-label="Параметры слайда">
         <section>
           <h3>Оформление</h3>
+          <label className="slide-hidden-toggle">
+            <span>
+              <EyeOff size={16} />
+              Показ слайда
+            </span>
+            <input
+              type="checkbox"
+              checked={Boolean(activeSlide.hidden)}
+              onChange={(event) => updateSlide({ ...activeSlide, hidden: event.target.checked || undefined })}
+            />
+            <span className="slide-hidden-toggle-text">Скрыть при показе слайд-шоу</span>
+          </label>
           <label>
             <span>
               <Palette size={16} />