fix: restore database cleanup functionality (#37) (#38)

The cleanup request was no longer precessed since we refactored the
settings page in v1.7.0 to use the WP settings API. Process the request
including nonce verification during page creation restores it.

inc/class-statifyblacklist-settings.php

@@ -170,6 +170,27 @@ public static function create_settings_page() {
 		?>
 		<div class="wrap">
 			<h1><?php esc_html_e( 'Statify Filter', 'statify-blacklist' ); ?></h1>
+			<?php
+			if ( isset( $_SERVER['REQUEST_METHOD'] ) && 'POST' === $_SERVER['REQUEST_METHOD'] && ! empty( $_POST['cleanup'] ) ) {
+				// Database cleanup requested.
+				if ( isset( $_REQUEST['_wpnonce'] ) && wp_verify_nonce( sanitize_key( $_REQUEST['_wpnonce'] ), 'statify-blacklist-options' ) ) {
+					// Nonce verification successful, proceed with cleanup.
+					StatifyBlacklist_Admin::cleanup_database();
+					?>
+					<div class="notice notice-success is-dismissible">
+						<p><?php esc_html_e( 'Database cleanup successful', 'statify-blacklist' ); ?></p>
+					</div>
+					<?php
+				} else {
+					// Nonce verification failed.
+					?>
+					<div class="notice notice-error is-dismissible">
+						<p><?php esc_html_e( 'Database cleanup request failed', 'statify-blacklist' ); ?></p>
+					</div>
+					<?php
+				}
+			}
+			?>
 
 			<form id="statify-settings" method="post" action="options.php">
 				<?php
@@ -178,7 +199,8 @@ public static function create_settings_page() {
 				submit_button();
 				?>
 				<hr>
-				<input class="button-secondary" type="submit" name="cleanUp"
+				<input class="button-secondary" type="submit" name="cleanup"
+					formaction=""
 					value="<?php esc_html_e( 'CleanUp Database', 'statify-blacklist' ); ?>"
 					onclick="return confirm('<?php echo esc_js( __( 'Do you really want to apply filters to database? This cannot be undone.', 'statify-blacklist' ) ); ?>');">
 				<p class="description">