Improve copy token button feedback with visual confirmation

templates/api_tokens.html

@@ -194,8 +194,16 @@
 
         function copyTokenFromModal() {
             const tokenText = document.getElementById('modalTokenText');
+            const copyBtn = document.querySelector('#tokenModal .copy-btn');
+            const originalText = copyBtn.textContent;
+
             navigator.clipboard.writeText(tokenText.textContent).then(function() {
-                alert('Token copied to clipboard!');
+                copyBtn.textContent = 'Copied!';
+                copyBtn.style.background = '#10b981';
+                setTimeout(function() {
+                    copyBtn.textContent = originalText;
+                    copyBtn.style.background = '';
+                }, 2000);
             }, function(err) {
                 // Fallback for older browsers
                 const textArea = document.createElement('textarea');
@@ -204,7 +212,12 @@
                 textArea.select();
                 document.execCommand('copy');
                 document.body.removeChild(textArea);
-                alert('Token copied to clipboard!');
+                copyBtn.textContent = 'Copied!';
+                copyBtn.style.background = '#10b981';
+                setTimeout(function() {
+                    copyBtn.textContent = originalText;
+                    copyBtn.style.background = '';
+                }, 2000);
             });
         }