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

frontend/src/routes/raw-materials/+page.svelte

@@ -152,19 +152,6 @@
     <a href="/">Return to sign-in</a>
   </section>
 {:else}
-  <section class="page-intro">
-    <div>
-      <p class="eyebrow">Input Cost Control</p>
-      <h2>Maintain raw materials with a cleaner operational workflow.</h2>
-      <p>Update source pricing, track downstream exposure, and keep the costing engine current from one workspace.</p>
-    </div>
-
-    <div class="intro-chip">
-      <span>{$clientSession.email}</span>
-      <strong>{activeMaterials.length} active materials</strong>
-    </div>
-  </section>
-
   {#if successMessage}
     <p class="feedback success">{successMessage}</p>
   {/if}