feat: tambah widget statistik kas dan perbaikan alur verifikasi transaksi

- Tambah CashStatsWidget: total saldo, pemasukan/pengeluaran bulan ini, saldo bulan lalu
- Widget hanya tampil di halaman transaksi kas (bukan dashboard)
- Hanya transaksi yang sudah diverifikasi masuk ke perhitungan total kas
- Perbaiki namespace Action notifikasi (Filament v5)
- Perbaiki observer: hapus throw Exception yang menyebabkan widget hilang
- Tambah redirect setelah aksi setujui/tolak/verifikasi agar halaman refresh otomatis
- Tambah file DOKUMENTASI.md

app/Filament/Resources/CashRecords/Pages/ListCashRecords.php

@@ -3,6 +3,7 @@
 namespace App\Filament\Resources\CashRecords\Pages;
 
 use App\Filament\Resources\CashRecords\CashRecordResource;
+use App\Filament\Widgets\CashStatsWidget;
 use Filament\Actions\CreateAction;
 use Filament\Resources\Pages\ListRecords;
 
@@ -12,8 +13,11 @@ class ListCashRecords extends ListRecords
 
     protected function getHeaderActions(): array
     {
-        return [
-            CreateAction::make(),
-        ];
+        return [CreateAction::make()];
+    }
+
+    protected function getHeaderWidgets(): array
+    {
+        return [CashStatsWidget::class];
     }
 }

app/Filament/Resources/CashRecords/Tables/CashRecordsTable.php

@@ -92,7 +92,8 @@ class CashRecordsTable
                             'success',
                             route('filament.admin.resources.cash-records.index')
                         );
-                    }),
+                    })
+                    ->after(fn ($livewire) => redirect(request()->header('Referer'))),
 
                 // Ketua: tolak transaksi 500rb–2jt
                 Action::make('reject_ketua')
@@ -125,7 +126,8 @@ class CashRecordsTable
                             'danger',
                             route('filament.admin.resources.cash-records.index')
                         );
-                    }),
+                    })
+                    ->after(fn ($livewire) => redirect(request()->header('Referer'))),
 
                 // Bendahara/ketua: verifikasi (hanya jika approval sudah selesai atau tidak diperlukan)
                 Action::make('verify')
@@ -155,7 +157,8 @@ class CashRecordsTable
                     ->action(fn (CashRecord $record) => $record->update([
                         'verified_by' => auth()->id(),
                         'verified_at' => now(),
-                    ])),
+                    ]))
+                    ->after(fn ($livewire) => redirect(request()->header('Referer'))),
 
                 EditAction::make()->hidden(fn ($record) => $record->verified_at !== null),
             ])