fix(android settings): move gap below Musik-Match, not above it

The Column already spaces children 12dp; the extra Spacer(8dp) between
"Meine Statistiken" and "Musik-Match" stacked to ~20dp, making that gap look
too big while Musik-Match↔Speichern stayed tight. Group the two stat buttons
together (12dp) and add the separating space (4dp) before the Save button.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

android/app/src/main/kotlin/com/novasonic/app/ui/screen/SettingsScreen.kt

@@ -88,7 +88,6 @@ fun SettingsScreen(onOpenStats: () -> Unit = {}, onOpenCompare: () -> Unit = {})
             Text("📊 Meine Statistiken", color = NsOnSurface, fontFamily = Outfit, fontWeight = FontWeight.SemiBold)
         }
 
-        Spacer(Modifier.height(8.dp))
         OutlinedButton(
             onClick = onOpenCompare,
             modifier = Modifier.fillMaxWidth().height(48.dp),
@@ -97,6 +96,7 @@ fun SettingsScreen(onOpenStats: () -> Unit = {}, onOpenCompare: () -> Unit = {})
         }
 
         // ── Save button (TOP) ────────────────────────────────────────────────
+        Spacer(Modifier.height(4.dp))
         SaveButton(vm, state.isSaving, state.savedOk, state.error)
 
         // ── 🎨 Theme ─────────────────────────────────────────────────────────