fix: 历史会话工具调用展示 — 可折叠工具卡片

src/renderer/styles/style.css

@@ -2092,6 +2092,78 @@ html, body {
     color: var(--critical);
 }
 
+/* ── 聊天区域工具调用历史（可折叠）── */
+.tool-calls-history {
+    margin: 8px 0;
+    border: 1px solid var(--border-default);
+    border-radius: var(--radius-md);
+    overflow: hidden;
+    background: var(--bg-layer);
+}
+
+.tool-calls-toggle {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    padding: 8px 12px;
+    cursor: pointer;
+    user-select: none;
+    font-size: 12px;
+    color: var(--text-secondary);
+    transition: background 0.15s;
+}
+
+.tool-calls-toggle:hover {
+    background: var(--bg-hover);
+}
+
+.tool-calls-chevron {
+    font-size: 10px;
+    transition: transform 0.2s;
+    color: var(--text-tertiary);
+}
+
+.tool-calls-history.expanded .tool-calls-chevron {
+    transform: rotate(90deg);
+}
+
+.tool-calls-summary {
+    font-family: var(--font);
+    font-weight: 500;
+}
+
+.tool-calls-list {
+    display: none;
+    padding: 0 8px 8px;
+}
+
+.tool-calls-history.expanded .tool-calls-list {
+    display: block;
+}
+
+.tool-calls-list .tool-call-card {
+    margin: 6px 0;
+    font-size: 12px;
+}
+
+.tool-calls-list .tool-call-header {
+    padding: 6px 10px;
+}
+
+.tool-calls-list .tool-call-params {
+    padding: 4px 10px;
+}
+
+.tool-calls-list .tool-call-result {
+    padding: 6px 10px;
+    max-height: 200px;
+}
+
+.tool-calls-list .tool-result-content {
+    font-size: 11px;
+    max-height: 150px;
+}
+
 /* 状态颜色 */
 .tool-call-pending {
     border-color: rgba(212, 160, 60, 0.3);