Implement ticket reply functionality

Backend:
- POST /:id/comment endpoint accepting {body, internal?, creator_id?}
- internal=false → Correspond (public reply), internal=true → Comment
- Runs scrip engine on the new transaction so notifications fire
- CommentSchema zod validation

Frontend:
- sendComment() API function in lib/api.ts
- Send button wired with onClick, sending spinner, disabled state
- Error display below reply box, clears on new typing
- Refreshes transaction list after successful send
- Reply/Internal note mode passed as internal flag

web/src/app/tickets/[id]/page.tsx

@@ -11,6 +11,7 @@ import {
   getQueues,
   previewTicket,
   updateTicket,
+  sendComment,
 } from "@/lib/api";
 import type {
   Ticket,
@@ -164,6 +165,8 @@ export default function TicketDetailPage({
   // Reply
   const [replyText, setReplyText] = useState("");
   const [replyMode, setReplyMode] = useState<"public" | "internal">("public");
+  const [sending, setSending] = useState(false);
+  const [sendError, setSendError] = useState<string | null>(null);
 
   // Status change
   const [statusSelectOpen, setStatusSelectOpen] = useState(false);
@@ -258,6 +261,28 @@ export default function TicketDetailPage({
     setScripResults(null);
   };
 
+  const handleSendComment = async () => {
+    if (!replyText.trim() || sending) return;
+    setSending(true);
+    setSendError(null);
+
+    const { error } = await sendComment(id, {
+      body: replyText.trim(),
+      internal: replyMode === "internal",
+    });
+
+    setSending(false);
+
+    if (error) {
+      setSendError(error);
+    } else {
+      setReplyText("");
+      setSendError(null);
+      const txRes = await getTicketTransactions(id);
+      if (txRes.data) setTransactions(txRes.data);
+    }
+  };
+
   if (loading) {
     return (
       <div className="flex h-full">
@@ -378,7 +403,10 @@ export default function TicketDetailPage({
           <div className="flex items-end gap-2">
             <textarea
               value={replyText}
-              onChange={(e) => setReplyText(e.target.value)}
+              onChange={(e) => {
+                setReplyText(e.target.value);
+                setSendError(null);
+              }}
               placeholder="Reply to this ticket..."
               rows={2}
               className="flex-1 px-3 py-2 rounded-lg bg-background border border-border text-sm text-foreground placeholder:text-muted-foreground outline-none focus:border-primary focus:ring-1 focus:ring-primary resize-none transition-all duration-150"
@@ -388,18 +416,30 @@ export default function TicketDetailPage({
                 <PaperclipIcon className="w-4 h-4" />
               </button>
               <button
-                disabled={!replyText.trim()}
+                onClick={handleSendComment}
+                disabled={!replyText.trim() || sending}
                 className={cn(
                   "w-8 h-8 flex items-center justify-center rounded-lg transition-all duration-150",
-                  replyText.trim()
+                  replyText.trim() && !sending
                     ? "bg-primary text-primary-foreground hover:bg-primary/80"
                     : "bg-muted text-muted-foreground cursor-not-allowed"
                 )}
               >
-                <SendIcon className="w-4 h-4" />
+                {sending ? (
+                  <svg className="w-4 h-4 animate-spin" viewBox="0 0 24 24" fill="none">
+                    <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
+                    <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
+                  </svg>
+                ) : (
+                  <SendIcon className="w-4 h-4" />
+                )}
               </button>
             </div>
           </div>
+
+          {sendError && (
+            <p className="text-xs text-destructive mt-2">{sendError}</p>
+          )}
         </div>
       </div>