fix(client): 状态下拉对照原型 .menu（白底圆角 + 选中蓝勾蓝字）

实现原是 Material 默认下拉（灰底 + 灰高亮块），改为对照原型 .menu/.menu-item：
白底圆角描边、选中项 lucide check 蓝勾 + 蓝字 fw600、去掉 initialValue 灰高亮。

注：此菜单样式多处复用（主题器/用户/列设置），下一步抽成 DsMenu 统一。

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

client/lib/screens/inventory/inventory_list_screen.dart

@@ -805,12 +805,40 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
                       SizedBox(width: 240, child: searchField),
                       const SizedBox(width: AppDims.sp3),
                       PopupMenuButton<String>(
-                        initialValue: _statusFilter,
                         onSelected: (v) => setState(() => _statusFilter = v),
-                        itemBuilder: (_) => const ['全部', '在售', '预警', '缺货']
+                        color: ctx.tokens.surface,
-                            .map((s) =>
+                        elevation: 8,
-                                PopupMenuItem(value: s, child: Text(s)))
+                        shape: RoundedRectangleBorder(
-                            .toList(),
+                          side: BorderSide(color: ctx.tokens.border),
+                          borderRadius: BorderRadius.circular(AppDims.rMd),
+                        ),
+                        itemBuilder: (_) =>
+                            ['全部', '在售', '预警', '缺货'].map((s) {
+                          final sel = s == _statusFilter;
+                          return PopupMenuItem<String>(
+                            value: s,
+                            height: 40,
+                            child: Row(children: [
+                              SizedBox(
+                                width: 18,
+                                child: sel
+                                    ? Icon(LucideIcons.check,
+                                        size: 15, color: ctx.tokens.primary)
+                                    : null,
+                              ),
+                              const SizedBox(width: 4),
+                              Text(s,
+                                  style: TextStyle(
+                                      fontSize: 13,
+                                      color: sel
+                                          ? ctx.tokens.primary
+                                          : ctx.tokens.text,
+                                      fontWeight: sel
+                                          ? FontWeight.w600
+                                          : FontWeight.w400)),
+                            ]),
+                          );
+                        }).toList(),
                         child: DsChip(
                           label: '状态',
                           value: _statusFilter == '全部' ? null : _statusFilter,