feat: add error handler for server summary tab

packages/web/src/tabs/ServerSummaryTab.svelte

@@ -82,6 +82,14 @@
       wrapper
     />
   {:then summary}
+    {#if 'errorMessage' in summary}
+      <div class="wrapper error-wrapper">
+        <div class="error-message">
+          <h3>{_t('serverSummaryTab.errorTitle', { defaultMessage: 'Error loading server summary' })}</h3>
+          <p>{summary.errorMessage}</p>
+        </div>
+      </div>
+    {:else}
       <div class="wrapper">
         <TabControl
           isInline
@@ -109,6 +117,7 @@
           ]}
         />
       </div>
+    {/if}
   {/await}
 
   <svelte:fragment slot="toolstrip">
@@ -130,4 +139,24 @@
   .action-separator {
     margin: 0 5px;
   }
+
+  .error-wrapper {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+
+  .error-message {
+    background: var(--theme-bg-1);
+    border: 1px solid var(--theme-border);
+    border-radius: 4px;
+    padding: 20px;
+    max-width: 500px;
+    text-align: center;
+  }
+
+  .error-message h3 {
+    color: var(--theme-font-error);
+    margin-top: 0;
+  }
 </style>