move view shop link to top of admin sidebar

More prominent placement just below the header, removed from footer.
Footer now only has dev tools disclosure and log out.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/berrypod_web/components/layouts/admin.html.heex

@@ -51,6 +51,13 @@
         </p>
       </div>
 
+      <%!-- view shop link --%>
+      <div class="admin-sidebar-view-shop">
+        <.link href={~p"/"} class="admin-btn admin-btn-ghost admin-btn-sm admin-btn-block">
+          <.icon name="hero-arrow-top-right-on-square" class="size-4" /> View shop
+        </.link>
+      </div>
+
       <%!-- nav links --%>
       <nav class="admin-sidebar-nav" aria-label="Admin navigation">
         <div class="admin-nav-group">
@@ -193,11 +200,6 @@
       <%!-- sidebar footer --%>
       <div class="admin-sidebar-footer">
         <ul class="admin-nav">
-          <li>
-            <.link href={~p"/"}>
-              <.icon name="hero-arrow-top-right-on-square" class="size-5" /> View shop
-            </.link>
-          </li>
           <li>
             <details class="admin-dev-tools">
               <summary>