fix: fatal error on servers with broken FTP filesystem configuration

[HardeepAsrani]

Summary

On some server setups (e.g. nginx with FTP configured but no active connection), WordPress initializes its FTP filesystem driver but fails when it tries to use it, throwing a PHP fatal error that crashes the page. Wrap the filesystem calls in a try/catch so any such failure falls back to the bundled customization.js gracefully.

Will affect visual aspect of the product

YES/NO

Screenshots

Test instructions

• In wp-config.php, add define( 'FS_METHOD', 'ftpext' ); — this forces WordPress to use the FTP filesystem driver without a real connection.
• Load any frontend page that has a Visualizer chart.
• Before the fix: PHP fatal error, page crashes.
• After the fix: page loads normally, charts render using the bundled customization.js.
• Remove the define from wp-config.php when done.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• [x ] The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes #1064.

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