fix: disable sending messages if both application and conversation are empty and add loading to all pages (#134)

* feat: add loading to all pages

* fix: disable sending messages if both application and conversation are empty

* feat: add chatSpin class to Spin of chat

web/src/pages/chat/index.less

@@ -41,6 +41,14 @@
     overflow: auto;
   }
 
+  .chatSpin {
+    :global(.ant-spin-container) {
+      display: flex;
+      flex-direction: column;
+      gap: 10px;
+    }
+  }
+
   .chatTitleCard {
     :global(.ant-card-body) {
       padding: 8px;