Access permissions, seed permissions, security, session, api/session improved handling + speed across the site/UX improvements

frontend/src/routes/mixes/+page.svelte

@@ -104,16 +104,8 @@
   });
 </script>
 
-<section class="page-intro">
-  <div>
-    <p class="eyebrow">Mix Master</p>
-    <h2>Saved mixes in a clean table view.</h2>
-    <p>Use the table to browse mixes, then open a dedicated worksheet page to edit or create a formulation.</p>
-  </div>
-
-  <div class="intro-actions">
-    <a class="primary-button" href="/mixes/new">New Mix Worksheet</a>
-  </div>
+<section class="page-actions">
+  <a class="primary-button" href="/mixes/new">New Mix Worksheet</a>
 </section>
 
 <section class="metric-row">
@@ -221,13 +213,17 @@
     text-transform: uppercase;
   }
 
-  .page-intro,
+  .page-actions,
   .metric-row,
   .table-card {
     margin-bottom: 1.12rem;
   }
 
-  .page-intro,
+  .page-actions {
+    display: flex;
+    justify-content: flex-end;
+  }
+
   .metric-card,
   .table-card {
     background: var(--panel);