Months shown setting and style colors

api.php

@@ -122,6 +122,8 @@ function migrate(PDO $db): void
         'planning_start_month' => '1',
         'planning_years' => '3',
         'planning_months' => '36',
+        'previous_months' => '5',
+        'future_months' => '30',
         'vacation_days_per_month' => '2.08',
         'feriefridage_per_year' => '5',
         'feriefridage_expiry_month' => '8',
@@ -156,6 +158,8 @@ function save_settings(PDO $db, array $settings): void
         'planning_start_month',
         'planning_years',
         'planning_months',
+        'previous_months',
+        'future_months',
         'vacation_days_per_month',
         'feriefridage_per_year',
         'feriefridage_expiry_month',