feat: iframe recovery overlay, timeout detection, and new tab authentication link for cross-origin access blocks

static/css/style.css

@@ -919,10 +919,164 @@ body, html {
 .hub-iframe-wrapper {
   width: 100%;
   height: 100%;
+  display: flex;
+  flex-direction: column;
   position: relative;
+  overflow: hidden;
+}
+
+.hub-iframe-topbar {
+  height: 36px;
+  background-color: var(--hub-bg-sidebar);
+  border-bottom: 1px solid var(--hub-border-subtle);
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 0 1rem;
+  flex-shrink: 0;
+  z-index: 5;
+}
+
+.hub-iframe-url-pill {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  font-size: 0.75rem;
+  color: var(--hub-text-secondary);
+}
+
+.hub-iframe-topbar-actions {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.hub-btn-iframe-action {
+  background: var(--hub-bg-card);
+  border: 1px solid var(--hub-border-subtle);
+  color: var(--hub-text-secondary);
+  font-size: 0.7rem;
+  font-weight: 500;
+  padding: 3px 8px;
+  border-radius: var(--hub-radius-sm);
+  display: flex;
+  align-items: center;
+  gap: 0.35rem;
+  text-decoration: none;
+  cursor: pointer;
+  transition: all 0.15s ease;
+}
+
+.hub-btn-iframe-action:hover {
+  color: var(--hub-text-primary);
+  border-color: var(--hub-border-medium);
+  background: var(--hub-bg-card-hover);
+}
+
+/* Auth Recovery Notice */
+.hub-iframe-auth-notice {
+  position: absolute;
+  top: 44px;
+  left: 1rem;
+  right: 1rem;
+  background: linear-gradient(135deg, rgba(30, 27, 75, 0.95), rgba(15, 23, 42, 0.95));
+  border: 1px solid rgba(99, 102, 241, 0.4);
+  border-radius: var(--hub-radius-md);
+  padding: 0.6rem 1rem;
+  z-index: 20;
+  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
+  backdrop-filter: blur(8px);
+  animation: slideDownNotice 0.25s ease-out;
+}
+
+@keyframes slideDownNotice {
+  from { opacity: 0; transform: translateY(-8px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+
+.hub-auth-notice-content {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  justify-content: space-between;
+  flex-wrap: wrap;
+}
+
+.hub-auth-notice-icon {
+  font-size: 1.1rem;
+}
+
+.hub-auth-notice-text {
+  flex: 1;
+  min-width: 260px;
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.hub-auth-notice-text strong {
+  font-size: 0.8rem;
+  color: #e0e7ff;
+}
+
+.hub-auth-notice-text span {
+  font-size: 0.72rem;
+  color: #94a3b8;
+}
+
+.hub-auth-notice-buttons {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.hub-btn-auth-action {
+  background: var(--hub-accent-current);
+  color: #ffffff;
+  font-size: 0.72rem;
+  font-weight: 600;
+  padding: 4px 10px;
+  border-radius: var(--hub-radius-sm);
+  text-decoration: none;
+  transition: opacity 0.15s ease;
+  white-space: nowrap;
+}
+
+.hub-btn-auth-action:hover {
+  opacity: 0.9;
+}
+
+.hub-btn-auth-reload {
+  background: transparent;
+  border: 1px solid var(--hub-border-medium);
+  color: var(--hub-text-primary);
+  font-size: 0.72rem;
+  padding: 4px 8px;
+  border-radius: var(--hub-radius-sm);
+  cursor: pointer;
+  transition: background 0.15s ease;
+}
+
+.hub-btn-auth-reload:hover {
+  background: var(--hub-bg-card-hover);
+}
+
+.hub-btn-auth-dismiss {
+  background: transparent;
+  border: none;
+  color: var(--hub-text-muted);
+  font-size: 1.1rem;
+  cursor: pointer;
+  padding: 0 4px;
+  line-height: 1;
+}
+
+.hub-btn-auth-dismiss:hover {
+  color: var(--hub-text-primary);
 }
 
 .hub-workspace-iframe {
+  flex: 1;
   width: 100%;
   height: 100%;
   border: none;