feat(ui): update file transfer terminology

Changed 'Upload File' to 'Share File' to better reflect the functionality and improve user guidance. Added explanatory note informing users that the file will remain available as long as the page is open.

views/index.ejs

@@ -70,9 +70,9 @@
     <div class="container">
       <h1>Transfer.coffee</h1>
       <div class="section">
-        <h2>Upload File</h2>
+        <h2>Share File</h2>
         <input type="file" id="fileInput" />
-        <button onclick="uploadFile()">Upload</button>
+        <button onclick="uploadFile()">Share</button>
         <div class="progress" id="uploadProgress">
           <div class="progress-bar" id="uploadProgressBar">0%</div>
         </div>
@@ -111,7 +111,9 @@
             .then((response) => response.json())
             .then((data) => {
               const uploadResult = document.getElementById("uploadResult");
-              uploadResult.innerHTML = `File uploaded. Share this mnemonic: <strong>${data.mnemonic}</strong>`;
+              uploadResult.innerHTML = `Started sharing file. Share this mnemonic: <strong>${data.mnemonic}</strong>
+              <br>Note that the file will be available for download as long as this page is open.
+              `;
             });
 
           torrent.on("upload", () => {