fix: resolve unresponsive edit button in PDF manager

- Implemented missing 'openEditModal' function in 'templates/pdf_manager.html'.
- Added event listeners for single-item 'Details' (edit) actions.
- Refactored bulk edit logic to use the shared modal function.
- Prevented 'Enter' key from triggering unwanted form submissions during renaming.

templates/pdf_manager.html

@@ -634,18 +634,8 @@
         bulkEditBtn.addEventListener('click', async () => {
             const selectedItems = getSelectedItems('pdf');
             if (selectedItems.length === 0) return;
-            await fetchSubjectsAndTags();
-            editData = [];
-            for (const item of selectedItems) {
-                const response = await fetch(`/get_pdf_details/${item.value}`);
-                if (response.ok) editData.push(await response.json());
-            }
-            if (editData.length > 0) {
-                currentEditIndex = 0;
-                initializeTomSelect();
-                populateEditModal(currentEditIndex);
-                editModal.show();
-            }
+            const ids = selectedItems.map(item => item.value);
+            await openEditModal(ids);
         });
 
         document.getElementById('edit-prev-btn').addEventListener('click', () => {
@@ -846,6 +836,30 @@
             }
         });
 
+        async function openEditModal(ids) {
+            await fetchSubjectsAndTags();
+            editData = [];
+            for (const id of ids) {
+                const response = await fetch(`/get_pdf_details/${id}`);
+                if (response.ok) editData.push(await response.json());
+            }
+            if (editData.length > 0) {
+                currentEditIndex = 0;
+                initializeTomSelect();
+                populateEditModal(currentEditIndex);
+                editModal.show();
+            }
+        }
+
+        // Single Edit
+        document.querySelectorAll('.edit-single-btn').forEach(btn => {
+            btn.addEventListener('click', async (e) => {
+                e.preventDefault();
+                const id = btn.dataset.id;
+                await openEditModal([id]);
+            });
+        });
+
         updateBulkButtons();
 
         const cards = Array.from(document.querySelectorAll('.col'));