PDF UX: instant rotate, delete all protection, reorder >1 only

- Rotate: click page = instant rotate + sync (no select+button)
- Delete: cannot delete all pages (error message)
- Reorder: grid only shown when >1 page
- Visual feedback: rotated page dims, hint shows progress

public/pdf.html

@@ -745,8 +745,7 @@
                     <span class="option-label" style="margin-top:8px;">Нажмите на страницы для поворота</span>
                     <div class="page-grid" id="rotatePageGrid"></div>
                     <div class="grid-action-bar">
-                        <button class="grid-action-btn primary" id="btnRotateSelected" disabled onclick="executeRotatePages()">Повернуть выбранные (<span id="rotateCount">0</span>)</button>
+                        <span class="page-grid-hint" id="rotateHint">Нажмите на страницу для поворота</span>
-                        <span class="page-grid-hint" id="rotateHint"></span>
                     </div>
                 </div>
             </div>
@@ -1189,7 +1188,14 @@
         if (_sel && typeof renderPageGrid === 'function') {
             renderPageGrid('deletePageGrid', 'deleteHint', _sel.id, _sel.pages, 'delete');
             renderPageGrid('rotatePageGrid', 'rotateHint', _sel.id, _sel.pages, 'rotate');
-            renderPageGrid('reorderPageGrid', 'reorderHint', _sel.id, _sel.pages, 'reorder');
+            if (_sel.pages > 1) {
+                renderPageGrid('reorderPageGrid', 'reorderHint', _sel.id, _sel.pages, 'reorder');
+            } else {
+                var rg = document.getElementById('reorderPageGrid');
+                var rh = document.getElementById('reorderHint');
+                if (rg) rg.innerHTML = '';
+                if (rh) rh.textContent = 'Нужно больше одной страницы';
+            }
         }
     }
 
@@ -1719,15 +1725,13 @@
                 });
             } else if (mode === 'rotate') {
                 thumb.addEventListener('click', () => {
-                    thumb.classList.toggle('selected');
+                    // Immediate rotate on click
-                    // Visual rotation preview
+                    const angle = state.rotateAngle || 90;
-                    if (thumb.classList.contains('selected')) {
+                    thumb.classList.add('rotate-' + angle);
-                        const angle = state.rotateAngle || 90;
+                    thumb.style.pointerEvents = 'none';
-                        thumb.classList.add('rotate-' + angle);
+                    thumb.style.opacity = '0.6';
-                    } else {
+                    // Auto-execute rotate for this page
-                        thumb.classList.remove('rotate-90', 'rotate-180', 'rotate-270');
+                    autoRotatePage(parseInt(thumb.dataset.page), angle);
-                    }
-                    updateRotateCount();
                 });
             } else if (mode === 'reorder') {
                 // Drag and drop
@@ -1797,6 +1801,11 @@
         if (!pages.length) { showError('Выберите страницы'); return; }
         const fileId = state.selectedFileId;
         if (!fileId) { showError('Выберите файл'); return; }
+        const selFile = state.files.find(f => f.id === fileId);
+        if (selFile && pages.length >= selFile.pages) {
+            showError('Нельзя удалить все страницы');
+            return;
+        }
         clearError();
         // Hide deleted pages visually
         const grid = document.getElementById('deletePageGrid');
@@ -1917,6 +1926,32 @@
         }
     }
 
+
+    // Auto-rotate single page on click
+    let _rotateTimeout = null;
+    function autoRotatePage(pageNum, angle) {
+        clearTimeout(_rotateTimeout);
+        const hint = document.getElementById('rotateHint');
+        if (hint) hint.textContent = 'Поворот страницы ' + pageNum + '...';
+        _rotateTimeout = setTimeout(async () => {
+            const fileId = state.selectedFileId;
+            if (!fileId) return;
+            try {
+                const res = await fetch('/pdf/rotate', {
+                    method: 'POST',
+                    headers: {'Content-Type':'application/json'},
+                    body: JSON.stringify({ fileId, pages: String(pageNum), angle })
+                });
+                const data = await res.json();
+                if (!res.ok) throw new Error(data.error);
+                if (hint) hint.textContent = 'Страница ' + pageNum + ' повёрнута';
+                await syncAfterOperation(data);
+            } catch(e) {
+                if (hint) hint.textContent = 'Ошибка: ' + e.message;
+            }
+        }, 300);
+    }
+
 })();
 
 </script>