Add a thin grey border around validation icons

Apply a border to various check and check circle icons across different modals and pages to visually distinguish them.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: b163d4c0-de5e-4f4e-a9c0-aed4c7049718
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/b163d4c0-de5e-4f4e-a9c0-aed4c7049718/93Mucz1

client/src/pages/Deliveries.tsx

@@ -449,7 +449,7 @@ export default function Deliveries() {
                                 className="text-green-600 hover:text-green-700"
                                 disabled={validateMutation.isPending}
                               >
-                                <Check className="w-4 h-4" />
+                                <Check className="w-4 h-4 border border-gray-300 rounded p-0.5" />
                               </Button>
                             )}
                             {canDelete && (