更新压缩机制，提高前缀缓存命中率，优化UI渲染机制，提高帧数

src/web/css/toolcalls.css

@@ -35,14 +35,15 @@
   transform: rotate(90deg);
 }
 .tc-list-toggle-body {
-  display: flex;
+  display: none;
   flex-direction: column;
   gap: 0.15rem;
   margin-top: 0.15rem;
-  max-height: 0;
+  max-height: none;
   overflow: hidden;
 }
 .tool-call-list-wrap--expanded .tc-list-toggle-body {
+  display: flex;
   overflow-y: auto;
   max-height: 75vh;
 }
@@ -174,17 +175,20 @@
   opacity: 0.8;
 }
 
-/* 展开详情区（行下方） */
+/* 展开详情区（行下方）。折叠态用 display:none 而非 max-height:0：
+   max-height:0 仍会对巨型 result_text 全量排版（大会话渲染/滚动的主要开销），
+   display:none 完全跳过布局，仅在展开瞬间排版一次。 */
 .tc-detail {
   margin: 0.15rem 0 0.3rem 1.4rem;
   padding: 0 0.45rem;
-  display: flex;
+  display: none;
   flex-direction: column;
   gap: 0.3rem;
-  max-height: 0;
+  max-height: none;
   overflow: hidden;
 }
 .tool-call-row--expanded + .tc-detail {
+  display: flex;
   max-height: 45vh;
   overflow-y: auto;
   padding: 0.3rem 0.45rem;
@@ -306,10 +310,11 @@
   color: var(--text, #475569);
   white-space: pre-wrap;
   word-break: break-word;
-  max-height: 0;
+  display: none;
   overflow: hidden;
 }
 .sub-reply-row--expanded .sub-reply-row-detail {
+  display: block;
   max-height: 400px;
   overflow-y: auto;
 }
@@ -434,10 +439,11 @@
   color: var(--muted, #64748b);
   white-space: pre-wrap;
   word-break: break-word;
-  max-height: 0;
+  display: none;
   overflow: hidden;
 }
 .think-row--expanded .think-row-detail {
+  display: block;
   max-height: 300px;
   padding: 0.35rem 0.5rem;
   overflow-y: auto;