fix: 空闲状态绝对定位居中，消除滚动条

src/renderer/styles/style.css

@@ -2406,6 +2406,7 @@ html, body {
 
 .ws-term-output {
     flex: 1;
+    position: relative;
     overflow-y: auto;
     padding: 10px 14px;
     font-size: 12px;
@@ -2429,7 +2430,8 @@ html, body {
     flex-direction: column;
     align-items: center;
     justify-content: center;
-    height: 100%;
+    position: absolute;
+    inset: 0;
     padding: 20px 16px;
     gap: 16px;
 }
@@ -2563,6 +2565,7 @@ html, body {
 /* 工具调用 Tab */
 .ws-tools-output {
     flex: 1;
+    position: relative;
     overflow-y: auto;
     padding: 10px 14px;
     font-size: 12px;
@@ -2815,6 +2818,7 @@ html, body {
 
 .ws-file-list {
     flex: 1;
+    position: relative;
     overflow-y: auto;
     padding: 4px 0;
 }