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/lib/api.ts

@@ -56,6 +56,10 @@ export async function getTicketTransactions(id: number): Promise<{ data: Transac
   return request<Transaction[]>(`/tickets/${id}/transactions`);
 }
 
+export async function sendComment(id: number, data: { body: string; internal?: boolean }): Promise<{ data: Transaction | null; error: string | null }> {
+  return request<Transaction>(`/tickets/${id}/comment`, { method: "POST", body: JSON.stringify(data) });
+}
+
 export async function getQueues(): Promise<{ data: Queue[] | null; error: string | null }> {
   return request<Queue[]>("/queues");
 }