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/Console/Commands/ConvertContent.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 
 namespace App\Console\Commands;
 
+use App\Blog\Support\SablogHtmlNormalizer;
 use App\Models\Post;
 use Illuminate\Console\Command;
 use League\HTMLToMarkdown\HtmlConverter;
@@ -36,6 +37,7 @@ class ConvertContent extends Command
         ]);
 
         $renderer = app(\App\Blog\Services\PostContentRenderer::class);
+        $normalizer = app(SablogHtmlNormalizer::class);
 
         $posts = $query->get();
         if ($posts->isEmpty()) {
@@ -49,7 +51,7 @@ class ConvertContent extends Command
 
         foreach ($posts as $post) {
             // [attach=xx] 是 markdown 保留字符，先换成令牌，渲染时再解析
-            $markdown = $converter->convert($renderer->toMarkdownSafeTokens($post->content));
+            $markdown = $normalizer->toMarkdown((string) $post->content, $converter, $renderer);
 
             if ($this->option('dry-run')) {
                 $this->newLine();