feat: improve patient flow and pricing workflow

lib/features/lab/finance/lab_finance_repository.dart

@@ -39,4 +39,30 @@ class LabFinanceRepository {
     }
     return {'pending': pending, 'paid': paid};
   }
+
+  Future<List<CounterpartyFinanceSummary>> byCounterparty(String tenantId) async {
+    final entries = await listEntries(tenantId, limit: 300);
+    final map = <String, CounterpartyFinanceSummary>{};
+
+    for (final entry in entries) {
+      final key = entry.counterpartyTenantId ?? entry.counterpartyName ?? 'unknown';
+      final current = map[key];
+      final pending = (current?.pendingAmount ?? 0) +
+          (entry.status == FinanceStatus.pending ? entry.amount : 0);
+      final paid = (current?.paidAmount ?? 0) +
+          (entry.status == FinanceStatus.paid ? entry.amount : 0);
+      map[key] = CounterpartyFinanceSummary(
+        counterpartyTenantId: entry.counterpartyTenantId,
+        counterpartyName: entry.counterpartyName ?? 'Karşı Taraf',
+        currency: entry.currency,
+        pendingAmount: pending,
+        paidAmount: paid,
+        entryCount: (current?.entryCount ?? 0) + 1,
+      );
+    }
+
+    final list = map.values.toList();
+    list.sort((a, b) => b.pendingAmount.compareTo(a.pendingAmount));
+    return list;
+  }
 }

lib/features/lab/finance/lab_finance_screen.dart

@@ -48,10 +48,12 @@ class _LabFinanceScreenState extends ConsumerState<LabFinanceScreen>
         LabFinanceRepository.instance.listEntries(tenantId, status: 'pending'),
         LabFinanceRepository.instance.listEntries(tenantId, status: 'paid'),
         LabFinanceRepository.instance.summary(tenantId),
+        LabFinanceRepository.instance.byCounterparty(tenantId),
       ]).then((results) => _FinanceData(
             pending: results[0] as List<FinanceEntry>,
             paid: results[1] as List<FinanceEntry>,
             summary: results[2] as Map<String, double>,
+            counterparties: results[3] as List<CounterpartyFinanceSummary>,
           ));
     });
   }
@@ -199,6 +201,15 @@ class _LabFinanceScreenState extends ConsumerState<LabFinanceScreen>
                     ],
                   ),
                 ),
+                if (data.counterparties.isNotEmpty)
+                  Padding(
+                    padding: const EdgeInsets.fromLTRB(16, 0, 16, 12),
+                    child: _CounterpartySummaryList(
+                      title: 'Klinik Bazlı Alacak',
+                      items: data.counterparties,
+                      formatAmount: formatAmount,
+                    ),
+                  ),
                 PillTabs(
                   tabs: [s.pending, s.collected],
                   selected: _tabController.index,
@@ -240,11 +251,13 @@ class _FinanceData {
     required this.pending,
     required this.paid,
     required this.summary,
+    required this.counterparties,
   });
 
   final List<FinanceEntry> pending;
   final List<FinanceEntry> paid;
   final Map<String, double> summary;
+  final List<CounterpartyFinanceSummary> counterparties;
 }
 
 class _SummaryCard extends StatelessWidget {
@@ -465,3 +478,66 @@ class _EntriesList extends StatelessWidget {
     );
   }
 }
+
+class _CounterpartySummaryList extends StatelessWidget {
+  const _CounterpartySummaryList({
+    required this.title,
+    required this.items,
+    required this.formatAmount,
+  });
+
+  final String title;
+  final List<CounterpartyFinanceSummary> items;
+  final String Function(double) formatAmount;
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: const EdgeInsets.all(14),
+      decoration: BoxDecoration(
+        color: AppColors.surface,
+        borderRadius: BorderRadius.circular(16),
+        border: Border.all(color: AppColors.border),
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(
+            title,
+            style: const TextStyle(
+              fontSize: 14,
+              fontWeight: FontWeight.w700,
+              color: AppColors.textPrimary,
+            ),
+          ),
+          const SizedBox(height: 10),
+          for (final item in items.take(5)) ...[
+            Row(
+              children: [
+                Expanded(
+                  child: Text(
+                    item.counterpartyName,
+                    style: const TextStyle(
+                      fontSize: 13,
+                      color: AppColors.textPrimary,
+                      fontWeight: FontWeight.w600,
+                    ),
+                  ),
+                ),
+                Text(
+                  formatAmount(item.pendingAmount),
+                  style: const TextStyle(
+                    fontSize: 13,
+                    color: AppColors.pending,
+                    fontWeight: FontWeight.w700,
+                  ),
+                ),
+              ],
+            ),
+            const SizedBox(height: 8),
+          ],
+        ],
+      ),
+    );
+  }
+}