feat: restore sablog browse modes and clean imported HTML

Keep the public site readable after import (nbsp, highlighter, wrapping code, compact pager) and finish the admin extras already in this tree: sticky levels, preview, page cache, and live llms.txt.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Filament/Resources/Posts/Pages/EditPost.php

@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-
 namespace App\Filament\Resources\Posts\Pages;
 
 use App\Filament\Resources\Posts\PostResource;
+use Filament\Actions\Action;
 use Filament\Actions\DeleteAction;
 use Filament\Resources\Pages\EditRecord;
 
@@ -16,6 +16,12 @@ class EditPost extends EditRecord
     protected function getHeaderActions(): array
     {
         return [
+            Action::make('preview')
+                ->label('预览')
+                ->icon('heroicon-o-eye')
+                ->color('gray')
+                ->url(fn (): string => $this->record->url)
+                ->openUrlInNewTab(),
             DeleteAction::make(),
         ];
     }