fix: settings screen design tweaks for mobile

- Center settings cog icon vertically in host card
- Normalize icon sizes (relay/host/settings all use iconSize.sm)
- Hide theme picker labels on mobile (icon-only)
- Simplify audio test copy, remove verbose description

packages/app/src/components/ui/segmented-control.tsx

@@ -23,6 +23,7 @@ type SegmentedControlProps<T extends string> = {
   value: T;
   onValueChange: (value: T) => void;
   size?: SegmentedControlSize;
+  hideLabels?: boolean;
   style?: StyleProp<ViewStyle>;
   testID?: string;
 };
@@ -32,6 +33,7 @@ export function SegmentedControl<T extends string>({
   value,
   onValueChange,
   size = "md",
+  hideLabels = false,
   style,
   testID,
 }: SegmentedControlProps<T>) {
@@ -72,12 +74,14 @@ export function SegmentedControl<T extends string>({
                 {option.icon({ color: iconColor, size: iconSize })}
               </View>
             ) : null}
-            <Text
-              style={[styles.label, labelSizeStyle, isSelected && styles.labelSelected]}
-              numberOfLines={1}
-            >
-              {option.label}
-            </Text>
+            {hideLabels ? null : (
+              <Text
+                style={[styles.label, labelSizeStyle, isSelected && styles.labelSelected]}
+                numberOfLines={1}
+              >
+                {option.label}
+              </Text>
+            )}
           </Pressable>
         );
       })}

packages/app/src/screens/settings-screen.tsx

@@ -78,16 +78,16 @@ function formatActiveConnectionBadge(input: {
     return null;
   }
   if (activeConnection.type === "relay") {
-    return { icon: <Globe size={theme.iconSize.xs} color={theme.colors.foregroundMuted} />, text: "Relay" };
+    return { icon: <Globe size={theme.iconSize.sm} color={theme.colors.foregroundMuted} />, text: "Relay" };
   }
   if (activeConnection.type === "directSocket") {
-    return { icon: <Monitor size={theme.iconSize.xs} color={theme.colors.foregroundMuted} />, text: "Local" };
+    return { icon: <Monitor size={theme.iconSize.sm} color={theme.colors.foregroundMuted} />, text: "Local" };
   }
   if (activeConnection.type === "directPipe") {
-    return { icon: <Monitor size={theme.iconSize.xs} color={theme.colors.foregroundMuted} />, text: "Local" };
+    return { icon: <Monitor size={theme.iconSize.sm} color={theme.colors.foregroundMuted} />, text: "Local" };
   }
   return {
-    icon: <Monitor size={theme.iconSize.xs} color={theme.colors.foregroundMuted} />,
+    icon: <Monitor size={theme.iconSize.sm} color={theme.colors.foregroundMuted} />,
     text: activeConnection.display,
   };
 }
@@ -230,6 +230,8 @@ const styles = StyleSheet.create((theme) => ({
     borderRadius: theme.borderRadius.md,
     gap: 0,
     marginLeft: theme.spacing[2],
+    alignItems: "center",
+    justifyContent: "center",
   },
   advancedTrigger: {
     flexDirection: "row",
@@ -685,7 +687,7 @@ export default function SettingsScreen() {
           return Uint8Array.from(bytes).buffer;
         },
       });
-      setPlaybackTestResult("Playback command completed.");
+      setPlaybackTestResult(null);
     } catch (error) {
       const message = error instanceof Error ? error.message : String(error);
       console.error("[Settings] Playback test failed", error);
@@ -878,6 +880,7 @@ export default function SettingsScreen() {
                 </View>
                 <SegmentedControl
                   size="sm"
+                  hideLabels={Platform.OS !== "web"}
                   value={settings.theme}
                   onValueChange={handleThemeChange}
                   options={[
@@ -910,10 +913,7 @@ export default function SettingsScreen() {
             <View style={[settingsStyles.card, styles.audioCard]}>
               <View style={styles.audioRow}>
                 <View style={styles.audioRowContent}>
-                  <Text style={styles.audioRowTitle}>Test audio playback</Text>
-                  <Text style={styles.aboutHintText}>
-                    Plays a built-in PCM sample through the current app audio engine.
-                  </Text>
+                  <Text style={styles.audioRowTitle}>Test audio</Text>
                   {playbackTestResult ? (
                     <Text style={styles.aboutHintText}>{playbackTestResult}</Text>
                   ) : null}
@@ -1463,7 +1463,7 @@ function DaemonCard({
             >
               {({ hovered = false, pressed = false }) => (
                 <Settings
-                  size={theme.iconSize.md}
+                  size={theme.iconSize.sm}
                   color={
                     hovered || pressed ? theme.colors.foreground : theme.colors.foregroundMuted
                   }