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/Widgets/CashStatsWidget.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace App\Filament\Widgets;
+
+use App\Models\CashRecord;
+use Filament\Widgets\StatsOverviewWidget;
+use Filament\Widgets\StatsOverviewWidget\Stat;
+use Illuminate\Support\Carbon;
+
+class CashStatsWidget extends StatsOverviewWidget
+{
+    protected int | string | array $columnSpan = 'full';
+
+    public static function canView(): bool
+    {
+        return request()->routeIs('filament.admin.resources.cash-records.index');
+    }
+
+    protected function getStats(): array
+    {
+        $saldo = fn ($query) => $query
+            ->whereNotNull('verified_at')
+            ->join('cash_categories', 'cash_records.category_id', '=', 'cash_categories.id')
+            ->selectRaw("SUM(CASE WHEN cash_categories.name = 'pemasukan' THEN amount ELSE -amount END) as saldo")
+            ->value('saldo') ?? 0;
+
+        $bulanIni   = now()->startOfMonth();
+        $bulanLalu  = now()->subMonth()->startOfMonth();
+
+        $totalSaldo      = $saldo(CashRecord::query());
+        $pemasukanBulanIni  = CashRecord::whereNotNull('verified_at')
+            ->join('cash_categories', 'cash_records.category_id', '=', 'cash_categories.id')
+            ->where('cash_categories.name', 'pemasukan')
+            ->whereMonth('date', $bulanIni->month)->whereYear('date', $bulanIni->year)
+            ->sum('amount');
+        $pengeluaranBulanIni = CashRecord::whereNotNull('verified_at')
+            ->join('cash_categories', 'cash_records.category_id', '=', 'cash_categories.id')
+            ->where('cash_categories.name', 'pengeluaran')
+            ->whereMonth('date', $bulanIni->month)->whereYear('date', $bulanIni->year)
+            ->sum('amount');
+        $saldoBulanLalu  = $saldo(CashRecord::query()->where('date', '<', $bulanIni));
+
+        return [
+            Stat::make('Total Saldo', 'Rp ' . number_format($totalSaldo, 0, ',', '.'))
+                ->description('Akumulasi semua transaksi')
+                ->color($totalSaldo >= 0 ? 'success' : 'danger')
+                ->icon('heroicon-o-banknotes'),
+
+            Stat::make('Pemasukan ' . $bulanIni->translatedFormat('F Y'), 'Rp ' . number_format($pemasukanBulanIni, 0, ',', '.'))
+                ->description('Total pemasukan bulan ini')
+                ->color('success')
+                ->icon('heroicon-o-arrow-trending-up'),
+
+            Stat::make('Pengeluaran ' . $bulanIni->translatedFormat('F Y'), 'Rp ' . number_format($pengeluaranBulanIni, 0, ',', '.'))
+                ->description('Total pengeluaran bulan ini')
+                ->color('danger')
+                ->icon('heroicon-o-arrow-trending-down'),
+
+            Stat::make('Saldo Bulan Lalu', 'Rp ' . number_format($saldoBulanLalu, 0, ',', '.'))
+                ->description($bulanLalu->translatedFormat('F Y'))
+                ->color($saldoBulanLalu >= 0 ? 'info' : 'warning')
+                ->icon('heroicon-o-clock'),
+        ];
+    }
+}

app/Filament/Widgets/StatsOverview.php

@@ -12,7 +12,8 @@ class StatsOverview extends StatsOverviewWidget
 {
     protected function getStats(): array
     {
-        $totalKas = CashRecord::join('cash_categories', 'cash_records.category_id', '=', 'cash_categories.id')
+        $totalKas = CashRecord::whereNotNull('verified_at')
+            ->join('cash_categories', 'cash_records.category_id', '=', 'cash_categories.id')
             ->selectRaw("SUM(CASE WHEN cash_categories.name = 'pemasukan' THEN amount ELSE -amount END) as saldo")
             ->value('saldo') ?? 0;