feat(monitor): add delta sync test button for Cluj-Napoca

Quick test button on /monitor page to trigger smart delta sync
(magic mode) on Cluj-Napoca and track progress via polling.

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

src/app/(modules)/monitor/page.tsx

@@ -235,6 +235,44 @@ export default function MonitorPage() {
             loading={actionLoading === "warm-cache"}
             onClick={triggerWarmCache}
           />
+          <ActionButton
+            label="Test Delta Sync — Cluj-Napoca"
+            description="Testeaza smart delta sync (quick-count + VALID_FROM + rolling doc)"
+            loading={actionLoading === "delta-test"}
+            onClick={async () => {
+              setActionLoading("delta-test");
+              addLog("info", "Pornire delta sync test pe Cluj-Napoca (54975)...");
+              try {
+                const res = await fetch("/api/eterra/sync-background", {
+                  method: "POST",
+                  headers: { "Content-Type": "application/json" },
+                  body: JSON.stringify({ siruta: "54975", mode: "magic", includeNoGeometry: false }),
+                });
+                const d = await res.json() as { jobId?: string; error?: string };
+                if (!res.ok) { addLog("error", d.error ?? "Eroare start"); setActionLoading(""); return; }
+                addLog("ok", `Job pornit: ${d.jobId}`);
+                // Poll progress
+                const jid = d.jobId;
+                if (pollRef.current) clearInterval(pollRef.current);
+                pollRef.current = setInterval(async () => {
+                  try {
+                    const pr = await fetch(`/api/eterra/progress?jobId=${jid}`);
+                    const pg = await pr.json() as { status?: string; phase?: string; downloaded?: number; total?: number; note?: string; message?: string };
+                    const pct = pg.total ? Math.round(((pg.downloaded ?? 0) / pg.total) * 100) : 0;
+                    addLog("wait", `${pg.phase ?? "..."} (${pct}%)${pg.note ? " — " + pg.note : ""}`);
+                    if (pg.status === "done" || pg.status === "error") {
+                      addLog(pg.status === "done" ? "ok" : "error", pg.message ?? pg.phase ?? "Finalizat");
+                      if (pollRef.current) { clearInterval(pollRef.current); pollRef.current = null; }
+                      setActionLoading("");
+                    }
+                  } catch { /* continue */ }
+                }, 5000);
+                setTimeout(() => {
+                  if (pollRef.current) { clearInterval(pollRef.current); pollRef.current = null; addLog("error", "Timeout 30min"); setActionLoading(""); }
+                }, 30 * 60_000);
+              } catch { addLog("error", "Eroare retea"); setActionLoading(""); }
+            }}
+          />
         </div>
         {logs.length > 0 && (
           <div className="border border-border rounded-lg overflow-hidden">