fix: restyle pager chips and restore theme ad slots

Replace the loose page-count label with a SaBlog-style 6 / 316 chip, wire inject/stylevar HTML into list and post views, and flush page cache when ads are saved.

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

themes/sablog/views/partials/footer.blade.php

@@ -1,4 +1,4 @@
-@stack('theme:footer')
+@include('partials.theme-inject', ['point' => 'footer'])
 <footer id="footer">
     <p>&copy; {{ date('Y') }} {{ $siteName }}
     @if($siteIcp)<a href="https://beian.miit.gov.cn/" target="_blank" rel="noopener">{{ $siteIcp }}</a>@endif

themes/sablog/views/partials/header.blade.php

@@ -4,7 +4,7 @@
         <a href="{{ route('home') }}">{{ $siteName }}</a>
         <p class="description">{{ $siteDescription }}</p>
     </div>
-@stack('theme:header')
+@include('partials.theme-inject', ['point' => 'header'])
     <nav id="nav">
         <ul>
             <li class="{{ request()->routeIs('home') ? 'current_page_item' : '' }}"><a href="{{ route('home') }}">首页</a></li>

themes/sablog/views/partials/sidebar.blade.php

@@ -1,5 +1,5 @@
 <aside class="sidebar">
-    @stack('theme:sidebar_top')
+    @include('partials.theme-inject', ['point' => 'sidebar_top'])
     <div class="searchbox">
         <form action="{{ route('search') }}" method="get">
             <input type="search" name="q" value="{{ request('q', request('keyword', '')) }}" placeholder="搜索文章">
@@ -83,5 +83,5 @@
             <li>标签 {{ $blogStats['tags'] }} 个</li>
         </ul>
     </section>
-    @stack('theme:sidebar_bottom')
+    @include('partials.theme-inject', ['point' => 'sidebar_bottom'])
 </aside>