🛠️ fix: Improve SSE Handling and Fix Typo in sendEmail Template (#1245)

* fix: typo for passwordReset.handlebars

* fix(useSSE): prevent unnecessary JSON.parse abort error, handle immediate abort-submit gracefully by reverting to previous state before immediate abort-submit, add showStopButton state to explicitly render disabled sendButton when message generation is cancelled, filter undefined messages and replace undefined convo for cancelHandler

api/server/middleware/abortMiddleware.js

@@ -8,7 +8,7 @@ async function abortMessage(req, res) {
   const { abortKey } = req.body;
 
   if (!abortControllers.has(abortKey) && !res.headersSent) {
-    return res.status(404).send('Request not found');
+    return res.status(404).send({ message: 'Request not found' });
   }
 
   const { abortController } = abortControllers.get(abortKey);