Simplify delete confirmation to native window.confirm

Bootstrap Modal async was unreliable. Replace with synchronous
window.confirm() which always works and needs no dependencies.

Co-authored-by: Copilot <[email protected]>

server/templates/base.html

@@ -107,41 +107,10 @@
     <script src="{{ url_for('static', filename='js/bs-init.js') }}"></script>
     <script src="{{ url_for('static', filename='js/theme.js') }}"></script>
 
-    {# ── Shared confirmation modal ─────────────────────────────────────────── #}
+    {# ── Shared confirmation helper ────────────────────────────────────────── #}
-    <div class="modal fade" id="confirm-modal" tabindex="-1" aria-labelledby="confirm-modal-label" aria-hidden="true">
-        <div class="modal-dialog modal-dialog-centered">
-            <div class="modal-content">
-                <div class="modal-header">
-                    <h5 class="modal-title" id="confirm-modal-label">Confirm delete</h5>
-                    <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
-                </div>
-                <div class="modal-body" id="confirm-modal-body">Are you sure?</div>
-                <div class="modal-footer">
-                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
-                    <button type="button" class="btn btn-danger" id="confirm-modal-ok">Delete</button>
-                </div>
-            </div>
-        </div>
-    </div>
     <script>
-    // Global helper: show confirmation modal, resolve true/false on user choice.
     window.confirmDelete = function(message) {
-        return new Promise(function(resolve) {
+        return Promise.resolve(window.confirm(message));
-            const modal = document.getElementById('confirm-modal');
-            document.getElementById('confirm-modal-body').textContent = message;
-            const bsModal = bootstrap.Modal.getOrCreate(modal);
-            const okBtn = document.getElementById('confirm-modal-ok');
-            function onOk() { cleanup(); resolve(true); }
-            function onHide() { cleanup(); resolve(false); }
-            function cleanup() {
-                okBtn.removeEventListener('click', onOk);
-                modal.removeEventListener('hidden.bs.modal', onHide);
-                bsModal.hide();
-            }
-            okBtn.addEventListener('click', onOk);
-            modal.addEventListener('hidden.bs.modal', onHide, { once: true });
-            bsModal.show();
-        });
     };
     </script>
     {% block scripts %}{% endblock %}