chore: sync app version to v1.9

Author: github-actions[bot]

index.html

@@ -197,7 +197,7 @@ <h1 class="brand-header">
       <img src="./company_logo.png" alt="Smart Parks logo" class="brand-logo">
       <span>Smart Parks - Log File Decoder</span>
     </h1>
-    <div id="appVersion" class="muted" style="margin: -2px 0 12px 0;">App version: v1.8</div>
+    <div id="appVersion" class="muted" style="margin: -2px 0 12px 0;">App version: v1.9</div>
     <div id="errorBanner"></div>
 
     <!-- === DECODER SECTION === -->