feat: add navigation badge for upcoming assignments and set badge color to danger

app/Filament/Resources/Learning/Assignments/AssignmentResource.php

@@ -20,6 +20,36 @@ class AssignmentResource extends Resource
 {
     protected static ?string $model = Assignment::class;
 
+    public static function getNavigationBadge(): ?string
+    {
+        $user = auth()->user();
+        if (! $user?->student) {
+            return null;
+        }
+
+        $student = $user->student;
+        $now = now();
+
+        $count = static::getEloquentQuery()
+            ->where('due_date', '>', $now)
+            ->where(function (Builder $query) use ($student) {
+                $query->whereHas('students', fn ($q) => $q->whereKey($student->id))
+                    ->orWhereHas('studyGroups', fn ($q) => $q->where('leader_id', $student->id)->orWhereHas('students', fn ($sq) => $sq->whereKey($student->id)));
+            })
+            ->whereDoesntHave('assignmentSubmissions', function (Builder $query) use ($student) {
+                $query->where('student_id', $student->id)
+                    ->orWhereHas('studyGroup', fn ($sq) => $sq->where('leader_id', $student->id)->orWhereHas('students', fn ($ssq) => $ssq->whereKey($student->id)));
+            })
+            ->count();
+
+        return $count > 0 ? (string) $count : null;
+    }
+
+    public static function getNavigationBadgeColor(): ?string
+    {
+        return 'danger';
+    }
+
     protected static string|UnitEnum|null $navigationGroup = 'Pembelajaran';
 
     protected static string|BackedEnum|null $navigationIcon = 'heroicon-o-clipboard-document-list';