[NEB-215] Update transaction confirmation prompt (#6861)

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## PR-Codex overview
This PR updates the transaction message in the `Chats` component to use a new function for generating the prompt, enhancing clarity and consistency in user communication.

### Detailed summary
- Replaced the inline message in `onTxSettled` with a call to `getTransactionSettledPrompt`.
- Added the `getTransactionSettledPrompt` function, which formats a detailed success message for a settled transaction.

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Author: MananTank

apps/dashboard/src/app/nebula-app/(app)/components/Chats.tsx

@@ -172,7 +172,7 @@ export function Chats(props: {
                               client={props.client}
                               onTxSettled={(txHash) => {
                                 props.sendMessage(
-                                  `I've sent the transaction with hash: ${txHash}.`,
+                                  getTransactionSettledPrompt(txHash),
                                 );
                               }}
                             />
@@ -209,6 +209,13 @@ export function Chats(props: {
   );
 }
 
+function getTransactionSettledPrompt(txHash: string) {
+  return `\
+I've executed the following transaction successfully with hash: ${txHash}.
+
+If our conversation calls for it, continue on to the next transaction or suggest next steps`;
+}
+
 function ExecuteTransactionCardWithFallback(props: {
   txData: NebulaTxData | null;
   client: ThirdwebClient;