fix(monitor): increase rebuild timeout to 30min + fix sample tile z14→z17

Martin now starts at z17, so z14 sample tile returned 404.
Rebuild timeout increased from 15 to 30 min for z16 builds.

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

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

@@ -80,15 +80,15 @@ export default function MonitorPage() {
           }
         } catch { /* continue polling */ }
       }, 15_000);
-      // Timeout after 15 min
+      // Timeout after 30 min (z16 builds can take 15-25 min)
       setTimeout(() => {
         if (pollRef.current) {
           clearInterval(pollRef.current);
           pollRef.current = null;
-          addLog("error", "Timeout: rebuild nu s-a finalizat in 15 minute");
+          addLog("error", "Timeout: rebuild nu s-a finalizat in 30 minute");
           setActionLoading("");
         }
-      }, 15 * 60_000);
+      }, 30 * 60_000);
     } catch {
       addLog("error", "Nu s-a putut trimite webhook-ul");
       setActionLoading("");