Clear cache on relaod

popup.html

@@ -11,7 +11,10 @@
     <main class="popup">
       <header class="popup-header">
         <h1><img class="brand-logo" src="logo.png" alt="Splirate"></h1>
-        <button id="openHistoryBtn" type="button">Open Full History</button>
+        <div class="header-actions">
+          <button id="clearBtn" type="button">Clear</button>
+          <button id="openHistoryBtn" type="button">History</button>
+        </div>
       </header>
       <section>
         <p id="status" class="status">Loading captured URLs...</p>