Restore filmstrip feature, fix server crash, and rename Grade label

index.html

@@ -109,7 +109,7 @@
                     <div class="gtmetrix-dashboard">
                         <!-- Grade Section -->
                         <div class="dashboard-card grade-card">
-                            <h3>GTmetrix Grade</h3>
+                            <h3>Grade</h3>
                             <div class="grade-container">
                                 <div id="overall-grade" class="grade-circle">
                                     <span class="grade-letter">-</span>