Fix Code Samples title: add explicit light text color on dark background

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: justinpreston

docs/index.html

@@ -1455,7 +1455,7 @@ <h2 class="card-title">Secure In-Boundary Processing</h2>
     <div class="card card-code span-4 row-2 reveal" aria-label="Sample code coming soon">
       <div class="card-glow" style="width:100px;height:100px;top:10px;right:10px;background:rgba(107,47,160,0.25);"></div>
       <div class="card-inner" style="padding:18px 22px;">
-        <div style="font-family:'Sora',sans-serif;font-weight:700;font-size:14px;letter-spacing:-0.3px;">Code Samples</div>
+        <div style="font-family:'Sora',sans-serif;font-weight:700;font-size:14px;letter-spacing:-0.3px;color:var(--text-primary);">Code Samples</div>
         <p style="font-size:11px;color:var(--text-secondary);margin-top:3px;line-height:1.5;">Pattern starters and reference architectures.</p>
         <div class="code-preview" aria-hidden="true" style="margin-top:8px;">
           <span class="code-line"><span class="kw">from</span> <span class="fn">cheatcode</span> <span class="kw">import</span> <span class="fn">patterns</span></span>