fix(settings): tidy spacing, uniform Android row heights & toggle layout

- spacing: top padding + inter-group gaps so section titles, descriptions
  and buttons no longer touch (playback buffer, audio/subtitles, music,
  marlin, kefin, streamystats, storage, hide-libraries)
- ListGroup: skip empty section titles
- SettingSwitch: cap the native Android switch in a fixed centered box so
  toggle rows match the other rows and stay put when toggled; iOS unchanged
- Appearance: move "Hide libraries" to the end of the list

components/common/SettingSwitch.tsx

@@ -0,0 +1,40 @@
+import type React from "react";
+import { Platform, Switch, type SwitchProps, View } from "react-native";
+
+/**
+ * Settings toggle. Android's native Switch lays out ~40px tall / ~56px wide and
+ * inflates list rows (iOS renders it ~31px). A plain `transform: scale` is
+ * visual-only and does NOT shrink the layout box, so we pin the Switch inside a
+ * FIXED-SIZE box (overflow hidden) and center it:
+ *  - the fixed height caps the row height (compact, uniform rows),
+ *  - the fixed width + centering keep the switch in the exact same spot in the
+ *    on/off states (a non-fixed wrapper let its width fluctuate between states,
+ *    which shifted the switch sideways on toggle).
+ * iOS renders the switch untouched.
+ *
+ * Tunables: BOX_H drives the row height; SCALE shrinks the visual to fit the
+ * box; keep BOX_W >= scaled visual width to avoid clipping the switch sideways.
+ */
+const BOX_W = 40;
+const BOX_H = 30;
+const SCALE = 0.9;
+
+export const SettingSwitch: React.FC<SwitchProps> = (props) => {
+  if (Platform.OS !== "android") return <Switch {...props} />;
+  return (
+    <View
+      style={{
+        width: BOX_W,
+        height: BOX_H,
+        alignItems: "center",
+        justifyContent: "center",
+        overflow: "hidden",
+      }}
+    >
+      <Switch
+        {...props}
+        style={[props.style, { transform: [{ scale: SCALE }] }]}
+      />
+    </View>
+  );
+};