Fix multiline options in admin saved improperly

These options depend on separating their values
with newlines, but sanitize_text_field strips
out newlines. Fix by using sanitize_textarea_field
instead.

Author: john-shaffer

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## Unreleased
 
+- Fix multiline options in admin did not save properly.
+
 ## 9.9.0 (2026-04-02)
 
 - Fix attempting to send deployment emails when no email address is set. 

src/Options.php

@@ -680,7 +680,7 @@ public static function saveFromAdmin(
             // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Nonce verification is handled by calling function
             if ( isset( $_POST[ $name ] ) ) {
                 // phpcs:ignore WordPress.Security.NonceVerification.Missing
-                $v = sanitize_text_field( wp_unslash( $_POST[ $name ] ) );
+                $v = sanitize_textarea_field( wp_unslash( $_POST[ $name ] ) );
             } else {
                 $v = '';
             }