Final touches on chalkboard.

static/skald.js

@@ -2635,6 +2635,17 @@ function updateChalkboardAccess() {
         'aria-label',
         canEdit ? 'Virtual chalkboard' : 'Virtual chalkboard, read only',
     );
+    updateChalkboardCopyButton();
+}
+
+function updateChalkboardCopyButton() {
+    let chalkboard = /** @type {HTMLTextAreaElement} */
+        (document.getElementById('chalkboard'));
+    let copyButton = /** @type {HTMLButtonElement} */
+        (document.getElementById('chalkboard-copy'));
+    if(!chalkboard || !copyButton)
+        return;
+    copyButton.disabled = chalkboard.value.length === 0;
 }
 
 function resetChalkboard() {
@@ -2650,6 +2661,27 @@ function resetChalkboard() {
     updateChalkboardAccess();
 }
 
+async function copyChalkboardToClipboard() {
+    let chalkboard = /** @type {HTMLTextAreaElement} */
+        (document.getElementById('chalkboard'));
+    if(!chalkboard || chalkboard.value.length === 0)
+        return;
+    try {
+        if(navigator.clipboard && navigator.clipboard.writeText) {
+            await navigator.clipboard.writeText(chalkboard.value);
+        } else {
+            chalkboard.focus();
+            chalkboard.select();
+            if(!document.execCommand('copy'))
+                throw new Error('copy command failed');
+        }
+        announceChat('Chalkboard copied to clipboard');
+    } catch(e) {
+        console.error(e);
+        displayError('Unable to copy chalkboard to clipboard');
+    }
+}
+
 /**
  * @param {any} message
  */
@@ -3677,6 +3709,7 @@ document.getElementById('input').onkeypress = function(e) {
 document.getElementById('chalkboard').addEventListener('input', function(e) {
     if(applyingChalkboardUpdate)
         return;
+    updateChalkboardCopyButton();
     scheduleChalkboardSend();
 });
 
@@ -3685,6 +3718,11 @@ document.getElementById('chalkboard').addEventListener('keydown', function(e) {
         return;
 });
 
+document.getElementById('chalkboard-copy').addEventListener('click', function(e) {
+    e.preventDefault();
+    copyChalkboardToClipboard();
+});
+
 function updateChatResizerValue(leftPercent) {
     let resizer = document.getElementById('resizer');
     if(!resizer)