Fix chart creation nonce verification mismatch

The security PR that was merged to development added nonce action
parameters to nonce creation and uploadData verification, but forgot
to update _handleTypesPage verification. This caused a mismatch where:

- Nonces were created WITH action: wp_create_nonce('visualizer-upload-data')
- But _handleTypesPage verified WITHOUT action: wp_verify_nonce($nonce)
- Result: Nonce verification failed, chart creation broken

This fix updates _handleTypesPage to verify WITH the action parameter
to match the nonce creation, allowing charts to be created successfully
while maintaining all security improvements.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: vytisbulkevicius

classes/Visualizer/Module/Chart.php

@@ -955,7 +955,7 @@ private function _handleDataAndSettingsPage() {
 	 */
 	private function _handleTypesPage() {
 		// process post request
-		if ( $_SERVER['REQUEST_METHOD'] === 'POST' && wp_verify_nonce( filter_input( INPUT_POST, 'nonce' ) ) ) {
+		if ( $_SERVER['REQUEST_METHOD'] === 'POST' && wp_verify_nonce( filter_input( INPUT_POST, 'nonce' ), 'visualizer-upload-data' ) ) {
 			$type = filter_input( INPUT_POST, 'type' );
 			$library = filter_input( INPUT_POST, 'chart-library' );
 			if ( Visualizer_Module_Admin::checkChartStatus( $type ) ) {