feat: add copy button next to registry number in table

Copies "nr. BTG-0042/2026 din 11.03.2026" to clipboard on click.
Small icon, subtle until hover, green check feedback on copy.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/modules/registratura/components/registry-table.tsx

@@ -12,6 +12,8 @@ import {
   Paperclip,
   Reply,
   CheckCircle2,
+  Copy,
+  Check,
 } from "lucide-react";
 import { Button } from "@/shared/components/ui/button";
 import { Badge } from "@/shared/components/ui/badge";
@@ -312,7 +314,10 @@ export function RegistryTable({
                 >
                   {visibleCols.has("number") && (
                     <td className="px-3 py-2 font-mono text-xs whitespace-nowrap">
-                      {entry.number}
+                      <span className="inline-flex items-center gap-1">
+                        {entry.number}
+                        <CopyNumberButton entry={entry} />
+                      </span>
                     </td>
                   )}
                   {visibleCols.has("date") && (
@@ -514,6 +519,37 @@ export function RegistryTable({
   );
 }
 
+function CopyNumberButton({ entry }: { entry: RegistryEntry }) {
+  const [copied, setCopied] = useState(false);
+
+  const handleCopy = (e: React.MouseEvent) => {
+    e.stopPropagation();
+    const text = `nr. ${entry.number} din ${formatDate(entry.date)}`;
+    void navigator.clipboard.writeText(text).then(() => {
+      setCopied(true);
+      setTimeout(() => setCopied(false), 1500);
+    });
+  };
+
+  const Icon = copied ? Check : Copy;
+
+  return (
+    <button
+      type="button"
+      onClick={handleCopy}
+      className={cn(
+        "inline-flex items-center justify-center h-4 w-4 rounded transition-colors",
+        copied
+          ? "text-green-600"
+          : "text-muted-foreground/40 hover:text-muted-foreground",
+      )}
+      title="Copiaza nr. din data de..."
+    >
+      <Icon className="h-3 w-3" />
+    </button>
+  );
+}
+
 function formatDate(iso: string): string {
   try {
     return new Date(iso).toLocaleDateString("ro-RO", {