Improve visibility of post success status in history

Update success icon color from default gradient to solid green and ensure checkmark icon is filled for better contrast in the history view.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/397bca8c-984f-43ff-841a-10897aeb8140/ae4037a0-2a6f-4530-9bac-79b543286bda/d2GBAIk

.replit

@@ -50,6 +50,10 @@ externalPort = 8081
 localPort = 40537
 externalPort = 3000
 
+[[ports]]
+localPort = 41569
+externalPort = 9000
+
 [[ports]]
 localPort = 41803
 externalPort = 8008

client/src/pages/history.tsx

@@ -138,12 +138,12 @@ export default function History() {
                           <div className="flex items-center gap-3 mb-3">
                             <div className={`w-10 h-10 rounded-xl flex items-center justify-center shadow-md ${
                               hasError ? 'bg-gradient-to-br from-destructive to-destructive/80' :
-                              'bg-gradient-to-br from-success to-success/80'
+                              'bg-gradient-to-br from-green-500 to-green-600'
                             }`}>
                               {hasError ? (
                                 <XCircle className="w-5 h-5 text-white" />
                               ) : (
-                                <CheckCircle className="w-5 h-5 text-white" />
+                                <CheckCircle className="w-5 h-5 text-white fill-white" />
                               )}
                             </div>
                             <CardTitle className="text-lg">