New action-in-bulk-action-group Rule

[krekas]

Adds a new best-practices rule that detects Action::make() used inside toolbarActions() / BulkActionGroup::make() and suggests replacing it with BulkAction::make(). The rule is auto-fixable and also adds the missing use Filament\Actions\BulkAction; import.

This is a common mistake in AI-generated Filament code — the code compiles and looks correct at first glance, but bulk actions require BulkAction::make() to receive the selected $records collection at runtime.

What it detects

• Action::make() inside BulkActionGroup::make()
• Action::make() directly inside toolbarActions()
• Works with any method that accepts a Table type-hinted parameter (not just table() — e.g. configure(Table $table))

Before

use Filament\Tables\Actions\Action;
use Filament\Tables\Actions\BulkActionGroup;
use Filament\Tables\Table;

class PostResource extends Resource
{
    public function table(Table $table): Table
    {
        return $table
            ->toolbarActions([
                BulkActionGroup::make([
                    // Wrong:
                    Action::make('approve')
                        ->label('Approve Selected')
                        ->action(function (Collection $records) {
                            // ...
                        }),
                ]),
            ]);
    }
}

After

use Filament\Actions\BulkAction;
use Filament\Tables\Actions\BulkActionGroup;
use Filament\Tables\Table;

class PostResource extends Resource
{
    public function table(Table $table): Table
    {
        return $table
            ->toolbarActions([
                BulkActionGroup::make([
                    // Correct:
                    BulkAction::make('approve')
                        ->label('Approve Selected')
                        ->action(function (Collection $records) {
                            // ...
                        }),
                ]),
            ]);
    }
}

Resolves #11