Refactor UI elements for consistency and clarity

- Updated action buttons across multiple files to use icons (e.g., "Save" to "💾+", "Delete" to "X").
- Replaced "Cancel" button text with a left arrow (←) for a more intuitive navigation experience.
- Removed unnecessary action columns from tables to streamline the interface.
- Enhanced table rows to be clickable for better user interaction, redirecting to relevant management pages.
- Adjusted font sizes and styles in CSS for improved readability and aesthetics.
- Standardized back button functionality to use a left arrow across various pages.

cartest.php

@@ -58,11 +58,11 @@ template_header('Cartest', 'cartest', 'view');
 $view = '
     <div class="content-title responsive-flex-wrap responsive-pad-bot-3">
         <h2 class="responsive-width-100">'.$cartest_h2.' - '.$_GET['rowID'].'</h2>
-        <a href="index.php?page=cartests" class="btn alt mar-right-2">'.$button_cancel.'</a>
+        <a href="index.php?page=cartests" class="btn alt mar-right-2">←</a>
 ';
 
 if ($update_allowed === 1 && $version != 0){
-    $view .= '<a href="index.php?page=cartest_manage&rowID='.$_GET['rowID'].'" class="btn">Edit</a>';
+    $view .= '<a href="index.php?page=cartest_manage&rowID='.$_GET['rowID'].'" class="btn">✏️</a>';
 }
 
 $view .= '</div>';