updates

lib/screens/settings_screen.dart

@@ -73,6 +73,18 @@ class SettingsScreen extends ConsumerWidget {
                     labelFor: AppSettings.formatLabel,
                     onSelect: controller.setDownloadFormat,
                   ),
+                  const SizedBox(height: TimbreSpacing.lg),
+                  const _Caption(
+                      'How many tracks download at once. Higher is faster on '
+                      'a strong connection; lower is gentler on the server.'),
+                  const SizedBox(height: TimbreSpacing.md),
+                  _Stepper(
+                    label: 'Simultaneous downloads',
+                    value: settings.maxConcurrentDownloads,
+                    min: AppSettings.minConcurrentDownloads,
+                    max: AppSettings.maxConcurrentDownloadsCap,
+                    onChanged: controller.setMaxConcurrentDownloads,
+                  ),
                 ],
               ),
             ),
@@ -380,6 +392,101 @@ class _Chip extends StatelessWidget {
   }
 }
 
+/// A labelled −/value/+ stepper bounded to [[min], [max]], styled to match the
+/// bordered-chip language of [_ChoiceChips].
+class _Stepper extends StatelessWidget {
+  const _Stepper({
+    required this.label,
+    required this.value,
+    required this.min,
+    required this.max,
+    required this.onChanged,
+  });
+
+  final String label;
+  final int value;
+  final int min;
+  final int max;
+  final ValueChanged<int> onChanged;
+
+  @override
+  Widget build(BuildContext context) {
+    final accent = Theme.of(context).colorScheme.primary;
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Text(label, style: const TextStyle(color: TimbreColors.foreground)),
+        const SizedBox(height: TimbreSpacing.sm),
+        Row(
+          children: [
+            _StepButton(
+              icon: Icons.remove,
+              accent: accent,
+              enabled: value > min,
+              onTap: () => onChanged(value - 1),
+            ),
+            Container(
+              constraints: const BoxConstraints(
+                  minWidth: TimbreSpacing.minTouchTarget,
+                  minHeight: TimbreSpacing.minTouchTarget),
+              alignment: Alignment.center,
+              child: Text(
+                '$value',
+                style: const TextStyle(
+                  color: TimbreColors.foreground,
+                  fontWeight: FontWeight.w700,
+                ),
+              ),
+            ),
+            _StepButton(
+              icon: Icons.add,
+              accent: accent,
+              enabled: value < max,
+              onTap: () => onChanged(value + 1),
+            ),
+          ],
+        ),
+      ],
+    );
+  }
+}
+
+class _StepButton extends StatelessWidget {
+  const _StepButton({
+    required this.icon,
+    required this.accent,
+    required this.enabled,
+    required this.onTap,
+  });
+
+  final IconData icon;
+  final Color accent;
+  final bool enabled;
+  final VoidCallback onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    return InkWell(
+      onTap: enabled ? onTap : null,
+      child: Container(
+        constraints: const BoxConstraints(
+            minWidth: TimbreSpacing.minTouchTarget,
+            minHeight: TimbreSpacing.minTouchTarget),
+        alignment: Alignment.center,
+        decoration: BoxDecoration(
+          border: Border.all(color: TimbreColors.border),
+          color: TimbreColors.surface,
+        ),
+        child: Icon(
+          icon,
+          size: 18,
+          color: enabled ? accent : TimbreColors.dimmed,
+        ),
+      ),
+    );
+  }
+}
+
 /// A row of accent-color chips — like [_ChoiceChips] but each chip shows a
 /// color swatch and the color's own hue drives the active border/fill.
 class _ColorChips extends StatelessWidget {