Sync cezen-portal/ from live working copy (V1.0 GA polish + search-icon ordering fix)

Brings the ISO-packaged portal copy current with the live cezen-portal/
working directory, which had drifted across the entire V1.0 GA polish
initiative (Phases 1-10) plus this session's topnav icon-order bugfix.

- 52 existing files updated, 2 new pages added (about.html, health.html)
- cgit/cezen-portal/ is now byte-identical to cezen-portal/
- Backend files (rag_ingest.py, cezen_license.py) already in sync;
  main.py intentionally left as-is (cgit is ahead there with
  workstation-category commercial-fit logic not yet backported to the
  live working copy)

Next: rebuild the ISO (bash autoinstall/build-iso.sh) to bake this in.

cezen-portal/tool-langchain.html

@@ -4,7 +4,7 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>LangChain — Nexus One AI Portal</title>
-  <link rel="stylesheet" href="style.css?v=4">
+  <link rel="stylesheet" href="style.css?v=12">
 </head>
 <body>
 
@@ -40,6 +40,7 @@
         <a href="dashboard.html">Dashboard</a>
         <a href="analytics.html">Usage Analytics</a>
         <a href="audit.html">Governance & Audit</a>
+        <a href="health.html">Health Center</a>
         <a href="feedback.html">Feedback &amp; Ratings</a>
         <span class="nav-drop-cat">MANAGE /</span>
         <a href="users.html">Users</a>
@@ -79,20 +80,20 @@
       </div>
     </div>
   </nav>
-    <a href="notifications.html" style="position:relative">🔔</a>
+    <a href="notifications.html" class="nav-icon-btn" style="position:relative" aria-label="Notifications"><span class="icon-svg icon-sm" aria-hidden="true"><svg viewBox="0 0 24 24"><path d="M15 17h5l-1.4-1.4A2 2 0 0 1 18 14.2V11a6 6 0 1 0-12 0v3.2a2 2 0 0 1-.6 1.4L4 17h5"/><path d="M10 17a2 2 0 0 0 4 0"/></svg></span></a>
     <span class="badge" data-brand="tier">Basic Tier</span>
   <div id="nav-org-logo" class="nav-org-logo"></div>
 </header>
 
 <div class="tool-hero">
-  <div class="tool-icon">🔗</div>
+  <div class="tool-icon">LC</div>
   <div class="tool-meta">
-    <a href="index.html#tools" class="back-link">← All Tools</a>
+    <a href="index.html#tools" class="back-link">All Tools</a>
     <h1>LangChain</h1>
     <div class="tagline">A Python toolkit for building AI workflows — connect models, documents, tools, and logic into automated pipelines.</div>
     <div class="hero-actions">
-      <a href="http://ai.local:8888" target="_blank" class="btn-primary">Open in Jupyter ↗</a>
-      <span class="access-pill">📓 Used via Jupyter or Python scripts</span>
+      <a href="http://ai.local:8888" target="_blank" class="btn-primary">Open in Jupyter</a>
+      <span class="access-pill">Used via Jupyter or Python scripts</span>
     </div>
   </div>
 </div>
@@ -118,7 +119,7 @@
   </div>
 
   <div class="notice">
-    💡 LangChain is for developers and technical staff. If you just want to chat with AI or documents, use <a href="tool-openwebui.html">Open WebUI</a> instead — no coding required.
+    LangChain is for developers and technical staff. If you just want to chat with AI or documents, use <a href="tool-openwebui.html">Open WebUI</a> instead - no coding required.
   </div>
 
   <div class="section-title">How a simple RAG pipeline works</div>
@@ -161,20 +162,20 @@
 
   <div class="section-title">Works with</div>
   <div class="works-with">
-    <a href="tool-ollama.html">🦙 Ollama</a>
-    <a href="tool-chromadb.html">🗂️ ChromaDB</a>
-    <a href="tool-jupyter.html">📓 Jupyter</a>
-    <a href="tool-fastapi.html">⚡ FastAPI</a>
+    <a href="tool-ollama.html">Ollama</a>
+    <a href="tool-chromadb.html">ChromaDB</a>
+    <a href="tool-jupyter.html">Jupyter</a>
+    <a href="tool-fastapi.html">FastAPI</a>
   </div>
 
 </div>
 
 <footer>
-  <p>Nexus One AI &nbsp;·&nbsp; Powered by Cezen &nbsp;·&nbsp; Basic Tier</p>
+  <p>Nexus One AI &nbsp;·&nbsp; Powered by Cezen &nbsp;·&nbsp; <span data-brand="tier">Basic Tier</span></p>
   <p>Questions? <a href="mailto:support@cezentech.com">support@cezentech.com</a></p>
 </footer>
 
 <script src="auth.js"></script>
-<script src="branding.js"></script>
+<script src="branding.js?v=3"></script>
 </body>
 </html>