修复：设置弹窗遮挡全局 chatDialog 按钮的问题

overflow-y:auto 会在 CSS 中创建新的堆叠上下文（stacking context），
导致即使全局弹窗 z-index 更高，在视觉上依然被 overflow 容器裁切，
造成「确定」按钮被弹窗底部遮挡无法点击。

修复方案：
- 外层容器移除 overflow-y:auto，改为 display:flex + flex-direction:column
- 标题栏加 flex-shrink:0 固定高度不被压缩
- 内容区单独加 overflow-y:auto + flex:1 保留滚动能力
- 外层遮罩 z-index 从 9999 提升至 10000（仍低于全局弹窗的 999999）

resources/views/chat/partials/toolbar.blade.php

@@ -80,20 +80,21 @@
 {{-- ═══════════ 个人设置弹窗 ═══════════ --}}
 <div id="settings-modal"
     style="display:none; position:fixed; top:0; left:0; right:0; bottom:0;
-    background:rgba(0,0,0,0.5); z-index:9999; justify-content:center; align-items:center;">
+    background:rgba(0,0,0,0.5); z-index:10000; justify-content:center; align-items:center;">
     <div
-        style="background:#fff; border-radius:8px; width:380px; max-height:90vh; overflow-y:auto;
-        box-shadow:0 8px 32px rgba(0,0,0,0.3);">
-        {{-- 标题栏 --}}
+        style="background:#fff; border-radius:8px; width:380px; max-height:90vh;
+        box-shadow:0 8px 32px rgba(0,0,0,0.3); display:flex; flex-direction:column;">
+        {{--  --}}}
         <div
             style="background:linear-gradient(135deg,#336699,#5a8fc0); color:#fff;
-            padding:12px 16px; border-radius:8px 8px 0 0; display:flex; justify-content:space-between; align-items:center;">
+            padding:12px 16px; border-radius:8px 8px 0 0; display:flex; justify-content:space-between; align-items:center; flex-shrink:0;">
             <span style="font-size:14px; font-weight:bold;">⚙️ 个人设置</span>
             <span onclick="document.getElementById('settings-modal').style.display='none'"
                 style="cursor:pointer; font-size:18px; opacity:0.8;">&times;</span>
         </div>
 
-        <div style="padding:16px;">
+        {{-- 内容滚动区：把 overflow-y:auto 放到内层，避免外层 overflow 创建堆叠上下文论clip全局弹窗 --}}
+        <div style="padding:16px; overflow-y:auto; flex:1;">
             {{-- 修改密码 --}}
             <div style="margin-bottom:16px; border:1px solid #e0e0e0; border-radius:6px; padding:12px;">
                 <div style="font-size:12px; font-weight:bold; color:#336699; margin-bottom:8px;">🔒 修改密码</div>