fix(rgi): fast download with fileVisibility gate + clear error message

Download route simplified:
1. fileVisibility check — if 404, returns "indisponibil" + eTerra URL
2. Single download pattern (the one that works)

When document not available server-side, response includes direct
eTerra URL as fallback. No more 7 pattern attempts = much faster.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/(modules)/rgi-test/page.tsx

@@ -295,30 +295,21 @@ function IssuedDocsPanel({
             </div>
           </div>
           <div className="flex items-center gap-1 shrink-0">
+            {/* Server-side download (works when fileVisibility returns OK) */}
             <Button
               size="sm"
               variant="outline"
               className="gap-1"
-              onClick={() => {
-                // Open eTerra directly — user's browser session has download permission
-                // First open confirmOnView, then download
-                const base = "https://eterra.ancpi.ro/eterra/api";
-                const wid = doc.workspaceId || workspaceId;
-                const appId = doc.applicationId || applicationPk;
-                const dpk = doc.documentPk;
-                // Open confirm in hidden iframe, then download
-                const iframe = document.createElement("iframe");
-                iframe.style.display = "none";
-                iframe.src = `${base}/rgi/appdetail/issueddocs/confirmOnView/${wid}/${appId}/${dpk}`;
-                document.body.appendChild(iframe);
-                setTimeout(() => {
-                  window.open(`${base}/rgi/appdetail/loadDocument/downloadFile/${wid}/${dpk}`, "_blank");
-                  iframe.remove();
-                }, 500);
-              }}
+              asChild
             >
-              <Download className="h-3.5 w-3.5" />
-              Descarca
+              <a
+                href={`/api/eterra/rgi/download-doc?workspaceId=${doc.workspaceId || workspaceId}&applicationId=${doc.applicationId || applicationPk}&documentPk=${doc.documentPk}&documentTypeId=${doc.documentTypeId}`}
+                target="_blank"
+                rel="noopener noreferrer"
+              >
+                <Download className="h-3.5 w-3.5" />
+                Descarca
+              </a>
             </Button>
           </div>
         </div>