PDF: remove step numbers (1/2/3/4) — cleaner UI without confusing numbering

public/pdf.html

@@ -654,7 +654,6 @@
     <!-- Step 1: Upload -->
     <div id="stepUpload" style="margin-bottom:24px;">
         <div class="section-title">
-            <span class="section-num">1</span>
             Загрузка файлов
         </div>
 
@@ -678,7 +677,6 @@
         <!-- Uploaded files list -->
         <div style="margin-bottom:24px;">
             <div class="section-title">
-                <span class="section-num">1</span>
                 Загруженные файлы
             </div>
             <div class="file-list" id="fileList"></div>
@@ -696,7 +694,6 @@
         <!-- Operation tabs -->
         <div style="margin-bottom:20px;">
             <div class="section-title">
-                <span class="section-num">2</span>
                 Операция
             </div>
             <div class="op-tabs-wrap">
@@ -983,7 +980,6 @@
         <!-- Step 3: Action + Progress -->
         <div id="step3Wrap" style="margin-bottom:24px;">
             <div class="section-title">
-                <span class="section-num">3</span>
                 Обработка
             </div>
             <div id="actionWrap">
@@ -1008,7 +1004,6 @@
         <!-- Step 4: Result -->
         <div id="stepResult" style="display:none;margin-bottom:24px;">
             <div class="section-title">
-                <span class="section-num">4</span>
                 Результат
             </div>
             <div class="result-card">