fix: Enter key confirms edit (Shift+Enter for newline)

Edit textarea now mirrors composer behavior:
- Enter alone → save the edit
- Shift+Enter → insert newline
- Escape → cancel edit

static/js/instructions.js

@@ -108,7 +108,8 @@ function renderPendingCard(item, index) {
 
   editTA.addEventListener('keydown', (e) => {
     if (e.key === 'Escape') { e.preventDefault(); hideEdit(); }
-    if ((e.metaKey || e.ctrlKey) && e.key === 'Enter') { e.preventDefault(); saveBtn.click(); }
+    if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); saveBtn.click(); }
+    // Shift+Enter → default browser behaviour (newline)
   });
 
   saveBtn.addEventListener('click', async () => {