fix(clipboard): fix copy to clipboard functionality

Added a `copyTextToClipboard` function to handle text copying across different browsers and fallback scenarios. This function utilizes the Clipboard API when available, providing an asynchronous method to copy text securely. For browsers where the Clipboard API is not available or the page is not served over a secure context, a fallback method using a temporary textarea element and `document.execCommand` is employed. Replaced direct use of `navigator.clipboard.writeText` with this function in the 'shareget' click event listener to enhance cross-browser support and error handling.

www/links.html

@@ -170,6 +170,57 @@ Telegram: rtmps://xxx-x.rtmp.t.me/s/xxxxxxxxxx:xxxxxxxxxxxxxxxxxxxxxx</pre>
         document.getElementById('sharedel').style.display = 'none';
     }
 
+    function copyTextToClipboard(text) {
+        // Modern approach with the Clipboard API
+        if (navigator.clipboard && window.isSecureContext) {
+            // Navigator clipboard is available
+            navigator.clipboard.writeText(text).then(function() {
+                console.log('Async: Copying to clipboard was successful!');
+            }, function(err) {
+                console.error('Async: Could not copy text: ', err);
+            });
+        } else {
+            // Fallback using document.execCommand()
+            try {
+                // Create a temporary element to hold the text to copy
+                var textarea = document.createElement("textarea");
+                // Make it almost invisible and uneditable
+                textarea.style.position = 'fixed';
+                textarea.style.top = 0;
+                textarea.style.left = 0;
+                textarea.style.width = '2em';
+                textarea.style.height = '2em';
+                textarea.style.padding = 0;
+                textarea.style.border = 'none';
+                textarea.style.outline = 'none';
+                textarea.style.boxShadow = 'none';
+                textarea.style.background = 'transparent';
+
+                // Set the text content and append the textarea to the body
+                textarea.value = text;
+                document.body.appendChild(textarea);
+
+                // Select all the text in the textarea
+                textarea.focus();
+                textarea.select();
+
+                // Attempt to copy the text selected in the textarea
+                var successful = document.execCommand('copy');
+                if (successful) {
+                    console.log('Fallback: Copying text command was successful!');
+                } else {
+                    console.error('Fallback: Could not copy text');
+                }
+
+                // Cleanup - remove the temporary textarea
+                document.body.removeChild(textarea);
+            } catch (err) {
+                console.error('Fallback: Exception while trying to copy', err);
+            }
+        }
+    }
+
+
     document.getElementById('shareadd').addEventListener('click', ev => {
         ev.preventDefault();
         share('POST').then(r => r.json()).then(r => onshareadd(r));
@@ -177,7 +228,7 @@ Telegram: rtmps://xxx-x.rtmp.t.me/s/xxxxxxxxxx:xxxxxxxxxxxxxxxxxxxxxx</pre>
 
     document.getElementById('shareget').addEventListener('click', ev => {
         ev.preventDefault();
-        navigator.clipboard.writeText(ev.target.href);
+        copyTextToClipboard(ev.target.href);
     });
 
     document.getElementById('sharedel').addEventListener('click', ev => {