fix(client): 外壳两处对齐修正（顶栏右组靠右 + 用户菜单与侧栏等宽）

- 顶栏：左组（品牌+门店）改 Expanded 占满，主题器+通知铃挤到最右；
  原 Flexible(flex1) 与 Spacer(flex1) 平分剩余空间导致右组浮在中右
- 侧栏底部用户菜单：constraints 固定 218 宽 + offset 左对齐侧栏左缘，与侧栏等宽
- 状态栏操作员显示 realName（王经理）而非 username

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TSKEiHsvauyxYUW2itzUXX

client/lib/screens/shell/app_shell.dart

@@ -160,6 +160,10 @@ class _AppShellState extends ConsumerState<AppShell> {
         border: Border(bottom: BorderSide(color: t.topBorder)),
       ),
       padding: EdgeInsets.only(top: topInset, left: isMobile ? 6 : 18, right: 14),
+      child: Row(
+        children: [
+          // 左组（占满剩余空间，靠左）：把右组（主题器+铃）挤到最右
+          Expanded(
             child: Row(
               children: [
                 if (isMobile) ...[
@@ -180,13 +184,17 @@ class _AppShellState extends ConsumerState<AppShell> {
                     margin: const EdgeInsets.symmetric(horizontal: 8),
                   ),
                 ],
-          // 门店品牌（鼎晟酒行）——点开门店信息
+                // 门店品牌（御品轩名酒坊）——点开门店信息；过长省略
                 Flexible(child: _ShopBrand(user: user)),
                 if (WriteGuard.isReadonly(ref)) ...[
                   const SizedBox(width: 10),
                   _readonlyBadge(t.topControl),
                 ],
-          const Spacer(),
+              ],
+            ),
+          ),
+          // 右组：主题器 + 通知铃，紧贴右侧
+          const SizedBox(width: 12),
           const ThemePickerPill(),
           const SizedBox(width: 14),
           const NotificationBell(),
@@ -281,7 +289,9 @@ class _AppShellState extends ConsumerState<AppShell> {
           child: PopupMenuButton<String>(
             tooltip: '账号菜单',
             position: PopupMenuPosition.over,
-            offset: const Offset(0, -8),
+            // 菜单与侧栏等宽（218），左对齐到侧栏左缘（抵消侧栏 12 内边距）
+            offset: const Offset(-12, -8),
+            constraints: const BoxConstraints.tightFor(width: 218),
             shape:
                 RoundedRectangleBorder(borderRadius: BorderRadius.circular(6)),
             color: t.menuUserBg,