Fix secondary fonts for Invoice Design preview

If a secondary font is used in the Invoice Design settings, it works in
the Custom Design editor, but the preview in General Settings always
shows Roboto in place of the secondary font, regardless of settings.

This updates PdfMock to also support secondary fonts on the main tab.

app/Services/Pdf/PdfMock.php

@@ -154,7 +154,7 @@ public function initEntity(): mixed
         $entity->tax_map = $this->getTaxMap();
         $entity->total_tax_map = $this->getTotalTaxMap();
         $entity->invitation->company = $this->company;
-        
+
         return $entity;
     }
 
@@ -242,14 +242,14 @@ public function getStubVariables(): array
     '$company.postal_code' => $this->settings->postal_code,
     '$client.billing_city' => 'Aufderharchester',
     '$secondary_font_name' => isset($this->settings?->secondary_font) ? $this->settings->secondary_font : 'Roboto',
+    '$secondary_font_url' => isset($this->settings?->secondary_font) ? \App\Utils\Helpers::resolveFont($this->settings->secondary_font)['url'] : 'https://fonts.googleapis.com/css2?family=Roboto&display=swap',
     '$product.line_total' => '',
     '$product.tax_amount' => '',
     '$company.vat_number' => $this->settings->vat_number,
     '$invoice.invoice_no' => '0029',
     '$quote.quote_number' => '0029',
     '$client.postal_code' => '11243',
     '$contact.first_name' => 'Benedict',
-    '$secondary_font_url' => 'https://fonts.googleapis.com/css2?family=Roboto&display=swap',
     '$contact.signature' => '',
     '$company_logo_size' => $this->settings->company_logo_size ?: '65%',
     '$product.tax_rate1' => ctrans('texts.tax'),
@@ -994,7 +994,7 @@ private function getVendorStubVariables()
 <table align="center" cellspacing="0" cellpadding="0" style="width: 600px;">
     <tr>
     <td align="center" valign="top">
-        <![endif]-->        
+        <![endif]-->
         <table align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" >
         <tbody><tr>
         <td align="center" class="new_button" style="border-radius: 2px; background-color: #298AAB">
@@ -1028,7 +1028,7 @@ private function getVendorStubVariables()
 <table align="center" cellspacing="0" cellpadding="0" style="width: 600px;">
     <tr>
     <td align="center" valign="top">
-        <![endif]-->        
+        <![endif]-->
         <table align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" >
         <tbody><tr>
         <td align="center" class="new_button" style="border-radius: 2px; background-color: #298AAB">
@@ -1059,7 +1059,7 @@ private function getVendorStubVariables()
 <table align="center" cellspacing="0" cellpadding="0" style="width: 600px;">
     <tr>
     <td align="center" valign="top">
-        <![endif]-->        
+        <![endif]-->
         <table align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" >
         <tbody><tr>
         <td align="center" class="new_button" style="border-radius: 2px; background-color: #298AAB">
@@ -1094,7 +1094,7 @@ private function getVendorStubVariables()
 <table align="center" cellspacing="0" cellpadding="0" style="width: 600px;">
     <tr>
     <td align="center" valign="top">
-        <![endif]-->        
+        <![endif]-->
         <table align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" >
         <tbody><tr>
         <td align="center" class="new_button" style="border-radius: 2px; background-color: #298AAB">