Add download client ordering and filtering to active downloads list

public/style.css

@@ -662,6 +662,42 @@ body {
   padding: 0;
 }
 
+/* Downloads header and controls */
+.downloads-header {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  margin-bottom: 12px;
+  flex-wrap: wrap;
+}
+
+.downloads-controls {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  flex-wrap: nowrap;
+}
+
+.download-client-label {
+  font-size: 0.85rem;
+  color: var(--text-secondary);
+}
+
+.download-client-select {
+  padding: 4px 8px;
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  background: var(--surface);
+  color: var(--text-primary);
+  font-size: 0.85rem;
+  cursor: pointer;
+}
+
+.download-client-select:focus {
+  outline: none;
+  border-color: var(--accent);
+}
+
 .history-header {
   display: flex;
   align-items: center;