feat(export): optimize batch export flow and unify session detail typing

src/pages/ChatPage.scss

@@ -2727,6 +2727,13 @@
         opacity: 0.7;
       }
     }
+
+    .detail-stats-meta {
+      margin-top: -6px;
+      margin-bottom: 10px;
+      font-size: 12px;
+      color: var(--text-tertiary);
+    }
   }
 
   .detail-item {
@@ -2764,6 +2771,26 @@
       }
     }
 
+    .detail-inline-btn {
+      border: none;
+      background: var(--bg-secondary);
+      color: var(--primary);
+      border-radius: 6px;
+      padding: 4px 8px;
+      font-size: 12px;
+      line-height: 1;
+      cursor: pointer;
+
+      &:disabled {
+        cursor: not-allowed;
+        opacity: 0.7;
+      }
+
+      &:hover:not(:disabled) {
+        background: var(--bg-hover);
+      }
+    }
+
     .copy-btn {
       display: flex;
       align-items: center;
@@ -2872,6 +2899,26 @@
     }
   }
 
+  .group-members-status {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    padding: 6px 16px;
+    font-size: 12px;
+    color: var(--text-secondary);
+    border-bottom: 1px solid var(--border-color);
+    background: var(--bg-secondary);
+
+    .spin {
+      animation: spin 1s linear infinite;
+    }
+
+    &.warning {
+      color: #b45309;
+      background: color-mix(in srgb, #f59e0b 10%, transparent);
+    }
+  }
+
   .group-members-list {
     flex: 1;
     min-height: 0;