fix: update TBR value and percentages in buildPreview method

app/Services/TbrCalculationService.php

@@ -306,10 +306,12 @@ private function resolveContract(int $unitId): FranchiseeContract
 
     private function buildPreview(FranchiseeContract $contract, int $referenceYear, int $referenceMonth, float $revenueValue): array
     {
+        $tbrConfig = Tbr::where('year', $referenceYear)->orderByDesc('id')->first();
+
         $tbrValue = (float) ($contract->tbr_fixed_value ?? 0);
 
         if ($tbrValue <= 0) {
-            $tbrValue = (float) (Tbr::where('year', $referenceYear)->orderByDesc('id')->value('tbr_value') ?? 0);
+            $tbrValue = (float) ($tbrConfig->tbr_value ?? 0);
         }
 
         if ($tbrValue <= 0) {
@@ -318,6 +320,9 @@ private function buildPreview(FranchiseeContract $contract, int $referenceYear,
             ]);
         }
 
+        $fnmPercentageConfig = $tbrConfig ? (float) $tbrConfig->fnm_percentage : self::FNM_BRACKET_PERCENTAGE;
+        $maintenancePercentageConfig = $tbrConfig ? (float) $tbrConfig->maintenance_percentage : self::MAINTENANCE_RATE;
+
         $contractMonth = $this->resolveContractMonth($contract->start_date, $referenceYear, $referenceMonth);
         $municipalitySizeId = (int) $contract->municipality_size_id;
 
@@ -332,8 +337,8 @@ private function buildPreview(FranchiseeContract $contract, int $referenceYear,
             : null;
         $royaltiesBracketPercentage = $royaltiesBracket ? (float) $royaltiesBracket->tbr_percentage : 0.0;
 
-        $fnmPercentage = $chargeFnm ? $this->resolveFnmPercentage($contractMonth) : 0.0;
-        $maintenancePercentage = self::MAINTENANCE_RATE;
+        $fnmPercentage = $chargeFnm ? $this->resolveFnmPercentage($contractMonth, $fnmPercentageConfig) : 0.0;
+        $maintenancePercentage = $maintenancePercentageConfig;
 
         $royaltiesBracketValue = round($royaltiesBracketPercentage * $tbrValue, 2);
         $fnmBracketValue = round($fnmPercentage * $tbrValue, 2);
@@ -563,9 +568,9 @@ private function findRoyaltiesBracket(int $municipalitySizeId, int $contractMont
         return $bracket;
     }
 
-    private function resolveFnmPercentage(int $contractMonth): float
+    private function resolveFnmPercentage(int $contractMonth, float $fnmPercentage): float
     {
-        return $contractMonth <= self::EXEMPT_THRESHOLD_MONTH ? 0.0 : self::FNM_BRACKET_PERCENTAGE;
+        return $contractMonth <= self::EXEMPT_THRESHOLD_MONTH ? 0.0 : $fnmPercentage;
     }
 
     private function resolveDueDate(?FranchiseeContract $contract, Carbon $referenceDate): Carbon