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>

lib/runner.js

@@ -147,6 +147,9 @@ async function _executeTest(url, options) {
 
     // Prepare JSON Summary
     const lhr = runnerResult.lhr;
+    
+
+
     const summary = {
       id: testId,
       url: lhr.finalUrl,
@@ -166,7 +169,6 @@ async function _executeTest(url, options) {
       isMobile: isMobile,
       filmstrip: captureFilmstrip ? (lhr.audits['screenshot-thumbnails']?.details?.items || []) : []
     };
-    };
 
     // Save JSON Summary
     const jsonPath = path.join(reportDir, `${testId}.json`);