Fix: More informative error messages in playground

Improved error messages in the playground to provide more specific feedback to the user when encountering issues. This makes it easier to understand the reason for the error and potentially resolve the problem.

server/src/handlers/api/v1/bot/playground/chat.handler.ts

@@ -195,7 +195,7 @@ export const chatRequestStreamHandler = async (
       return handleErrorResponse(
         history,
         message,
-        "There was an error processing your request."
+        "No embedding model found"
       );
     }
 
@@ -217,7 +217,7 @@ export const chatRequestStreamHandler = async (
       return handleErrorResponse(
         history,
         message,
-        "There was an error processing your request."
+        "Not model found"
       );
     }
 
@@ -288,11 +288,10 @@ export const chatRequestStreamHandler = async (
     await nextTick();
     return reply.raw.end();
   } catch (e) {
-    console.error(e);
     return handleErrorResponse(
       history,
       message,
-      "There was an error processing your request."
+      "Internal Server Error"
     );
   }
 };