fix(android) detekt: extract SignOutConfirmDialog helper

Sign-out confirm dialog landed inline in SettingsScreen and pushed
it past the 60-line cap (93/60). Same pattern as other dialog
extractions in the project.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/app/src/main/java/com/fabledsword/minstrel/settings/ui/SettingsScreen.kt

@@ -131,34 +131,42 @@ fun SettingsScreen(
         }
     }
     if (showSignOutConfirm) {
-        AlertDialog(
-            onDismissRequest = { showSignOutConfirm = false },
-            title = { Text("Sign out?") },
-            text = {
-                Text(
-                    "Sign out of this server? Your downloaded music and " +
-                        "settings on this device will be removed.",
-                )
-            },
-            confirmButton = {
-                Button(
-                    onClick = {
-                        showSignOutConfirm = false
-                        viewModel.signOut()
-                    },
-                    colors = ButtonDefaults.buttonColors(
-                        containerColor = MaterialTheme.colorScheme.errorContainer,
-                        contentColor = MaterialTheme.colorScheme.onErrorContainer,
-                    ),
-                ) { Text("Sign out") }
-            },
-            dismissButton = {
-                TextButton(onClick = { showSignOutConfirm = false }) { Text("Cancel") }
+        SignOutConfirmDialog(
+            onConfirm = {
+                showSignOutConfirm = false
+                viewModel.signOut()
             },
+            onDismiss = { showSignOutConfirm = false },
         )
     }
 }
 
+@Composable
+private fun SignOutConfirmDialog(onConfirm: () -> Unit, onDismiss: () -> Unit) {
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text("Sign out?") },
+        text = {
+            Text(
+                "Sign out of this server? Your downloaded music and " +
+                    "settings on this device will be removed.",
+            )
+        },
+        confirmButton = {
+            Button(
+                onClick = onConfirm,
+                colors = ButtonDefaults.buttonColors(
+                    containerColor = MaterialTheme.colorScheme.errorContainer,
+                    contentColor = MaterialTheme.colorScheme.onErrorContainer,
+                ),
+            ) { Text("Sign out") }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) { Text("Cancel") }
+        },
+    )
+}
+
 @Composable
 private fun NavTile(
     icon: ImageVector,