feat: update font to Roboto across templates and add campaign/ad group filters in product views

- Changed font from Open Sans to Roboto in layout files.
- Added campaign and ad group filters in products main view.
- Enhanced product history to include campaign and ad group IDs.
- Updated migrations to support new campaign and ad group dimensions in product statistics.
- Introduced new migration files for managing campaign types and dropping obsolete columns.

autoload/factory/class.Campaigns.php

@@ -8,10 +8,45 @@ class Campaigns
     return $mdb -> select( 'clients', '*', [ 'ORDER' => [ 'name' => 'ASC' ] ] );
   }
 
-  static public function get_campaigns_list( $client_id )
+  static public function get_campaigns_list( $client_id, $only_active = false )
   {
     global $mdb;
-    return $mdb -> select( 'campaigns', '*', [ 'client_id' => $client_id, 'ORDER' => [ 'campaign_name' => 'ASC' ] ] );
+
+    $client_id = (int) $client_id;
+
+    if ( !$only_active )
+    {
+      return $mdb -> select( 'campaigns', '*', [ 'client_id' => $client_id, 'ORDER' => [ 'campaign_name' => 'ASC' ] ] );
+    }
+
+    $latest_date = $mdb -> query(
+      'SELECT MAX( ch.date_add )
+       FROM campaigns_history AS ch
+       INNER JOIN campaigns AS c ON c.id = ch.campaign_id
+       WHERE c.client_id = :client_id
+         AND c.campaign_id <> 0',
+      [ ':client_id' => $client_id ]
+    ) -> fetchColumn();
+
+    if ( !$latest_date )
+    {
+      return $mdb -> select( 'campaigns', '*', [ 'client_id' => $client_id, 'ORDER' => [ 'campaign_name' => 'ASC' ] ] );
+    }
+
+    return $mdb -> query(
+      'SELECT c.*
+       FROM campaigns AS c
+       LEFT JOIN campaigns_history AS ch
+         ON ch.campaign_id = c.id
+        AND ch.date_add = :latest_date
+       WHERE c.client_id = :client_id
+         AND ( c.campaign_id = 0 OR ch.id IS NOT NULL )
+       ORDER BY c.campaign_name ASC',
+      [
+        ':client_id' => $client_id,
+        ':latest_date' => $latest_date
+      ]
+    ) -> fetchAll( \PDO::FETCH_ASSOC );
   }
 
   static public function get_campaign_history_data( $campaign_id, $start, $length, $revert = false )
@@ -144,6 +179,7 @@ class Campaigns
          st.ad_group_id AS db_ad_group_id,
          c.client_id,
          c.campaign_id AS external_campaign_id,
+         c.advertising_channel_type,
          ag.ad_group_id AS external_ad_group_id,
          cl.google_ads_customer_id
        FROM campaign_search_terms AS st