Refactor insurance share calculation logic in PatientService

- Consolidated the calculation of patient and insurance shares into a single method using BillingCalculator.
- Introduced new fields in PatientSession to store breakdown of insurance shares and patient share.
- Updated the API responses to include the new fields for consistency across payment, invoice, and claims dashboard.
- Added migration to backfill existing sessions with appropriate values for the new fields.
- Implemented tests to ensure the correctness of the new logic and verify that the breakdown sums to the gross total.
- Redesigned the claims dashboard to provide a more user-friendly overview of patient claims and their statuses.

migrations/Version20260718184932.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Persist the insurance share breakdown on patient sessions so the payment page,
+ * the invoice modal and the claims dashboard all read the same numbers instead of
+ * each deriving their own.
+ */
+final class Version20260718184932 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add insurance share breakdown columns to patient_sessions';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE patient_sessions '
+            . 'ADD gross_total_rials INT DEFAULT 0 NOT NULL, '
+            . 'ADD base_insurance_rials INT DEFAULT 0 NOT NULL, '
+            . 'ADD supplementary_insurance_rials INT DEFAULT 0 NOT NULL, '
+            . 'ADD patient_share_rials INT DEFAULT 0 NOT NULL');
+
+        // Existing sessions were computed without an insurance breakdown: the whole
+        // amount was the patient's share. Backfilling this way keeps their totals unchanged.
+        $this->addSql('UPDATE patient_sessions SET '
+            . 'patient_share_rials = final_price_rials, '
+            . 'gross_total_rials = final_price_rials, '
+            . 'base_insurance_rials = 0, '
+            . 'supplementary_insurance_rials = 0');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE patient_sessions '
+            . 'DROP gross_total_rials, '
+            . 'DROP base_insurance_rials, '
+            . 'DROP supplementary_insurance_rials, '
+            . 'DROP patient_share_rials');
+    }
+}