fix(podroll): move subscriptions to sidebar, use widget styling

- Remove withSidebar to avoid double sidebar
- Use layout-with-sidebar and main-content classes
- Style subscriptions widget like other sidebar widgets
- Remove height limit so subscriptions can expand fully

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

podroll.njk

@@ -2,7 +2,6 @@
 layout: layouts/base.njk
 title: Podroll
 permalink: /podroll/
-withSidebar: true
 ---
 <div class="podroll-page" x-data="podrollApp()" x-init="init()">
   <header class="mb-6 sm:mb-8">
@@ -28,9 +27,9 @@ withSidebar: true
     </p>
   </header>
 
-  <div class="flex flex-col lg:flex-row gap-8">
+  <div class="layout-with-sidebar">
     {# Main Content - Episodes #}
-    <div class="flex-1 min-w-0">
+    <div class="main-content">
       {# Loading State #}
       <div x-show="loading && episodes.length === 0" class="text-center py-12">
         <svg class="w-8 h-8 mx-auto text-primary-600 animate-spin mb-4" fill="none" viewBox="0 0 24 24">
@@ -179,22 +178,22 @@ withSidebar: true
     </div>
 
     {# Sidebar - Podcast Sources (OPML) #}
-    <aside class="lg:w-80 flex-shrink-0">
-      <div class="sticky top-4 bg-white dark:bg-surface-800 rounded-xl border border-surface-200 dark:border-surface-700 p-4 sm:p-6">
-        <h2 class="text-lg font-semibold text-surface-900 dark:text-surface-100 mb-4 flex items-center gap-2">
+    <aside class="sidebar">
+      <div class="widget">
+        <h3 class="widget-title flex items-center gap-2">
           <svg class="w-5 h-5 text-primary-600" fill="currentColor" viewBox="0 0 24 24">
             <circle cx="6.18" cy="17.82" r="2.18"/>
             <path d="M4 4.44v2.83c7.03 0 12.73 5.7 12.73 12.73h2.83c0-8.59-6.97-15.56-15.56-15.56zm0 5.66v2.83c3.9 0 7.07 3.17 7.07 7.07h2.83c0-5.47-4.43-9.9-9.9-9.9z"/>
           </svg>
           Subscriptions
           <span class="text-sm font-normal text-surface-500" x-text="'(' + sources.length + ')'"></span>
-        </h2>
+        </h3>
 
         <div x-show="sources.length === 0 && !loading" class="text-sm text-surface-500 text-center py-4">
           No subscriptions loaded yet.
         </div>
 
-        <ul x-show="sources.length > 0" class="space-y-2 max-h-[60vh] overflow-y-auto">
+        <ul x-show="sources.length > 0" class="space-y-2">
           <template x-for="source in sources" :key="source.xmlUrl">
             <li class="group">
               <a