refactor(client): 日期选择统一为扁平组件——输入框+滚轮同宽居中入面板，桌面/移动全覆盖

- wheel_date_picker.dart 重构为统一组件：单日期 showDsDateDropdown（面板=
  可输入框+三列滚轮+今天/确定）、范围 showDateRangeDropdown（起始|结束双窗格
  并排+共用底栏）；桌面锚定下拉（透明遮罩不冻结窗口）、窄屏底部 sheet 同内容
  （范围纵排）——同一套窗格两端复用
- 扁平化：输入框与滚轮同宽 248、文字水平垂直居中(mono)、去掉全部阴影/立体
  效果（滚轮外框仅 1px 边框，中心高亮带去描边）
- DsDateCell（录单日期格）与 DatePickerField（登记收支）改为触发器：点选/
  回车打开统一面板，键入在面板内完成；出库工具栏时间 chip 补切到新组件
- 旧 showWheelDatePicker/showWheelDateRange 两步弹窗删除；组件测试改写为
  新契约（触发器+面板键入+词法归一），表单 golden 随形态更新

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

client/lib/screens/shared/order_form_shell.dart

@@ -760,9 +760,8 @@ class RowActions extends StatelessWidget {
       );
 }
 
-/// 内联日期格（.datefield / .gci-date）：可直接键入（「2024」「2024-5-12」
-/// 「20240512」等，失焦/回车归一为 yyyy-MM-dd，同 DatePickerField 词法），
-/// 日历图标打开滚轮面板；值等宽显示。
+/// 内联日期格（.datefield / .gci-date）：点选或 Enter 打开统一日期下拉
+/// （面板内含可输入框 + 三列滚轮，见 wheel_date_picker.dart），值等宽显示。
 class DsDateCell extends StatefulWidget {
   final String? value; // yyyy-MM-dd
   final ValueChanged<String?> onChanged;
@@ -789,198 +788,86 @@ class DsDateCell extends StatefulWidget {
 }
 
 class _DsDateCellState extends State<DsDateCell> {
-  // 浮层锚定到字段下方（对齐原型 datewheel.js：pop.style.top = field.bottom + 4），
-  // 非居中弹窗，无遮罩——点字段外任意处收起（TapRegion.onTapOutside）。
-  final _link = LayerLink();
-  OverlayEntry? _entry;
-  bool get _open => _entry != null;
+  BuildContext? _anchorCtx; // 字段自身 ctx（Builder 捕获），下拉锚定于此
 
-  late final TextEditingController _ctrl =
-      TextEditingController(text: widget.value ?? '');
-  FocusNode? _ownFocus; // 调用方没给 focusNode 时自建（自建才由本组件 dispose）
-  FocusNode get _focus => widget.focusNode ?? (_ownFocus ??= FocusNode());
-
-  @override
-  void initState() {
-    super.initState();
-    _focus.addListener(_onFocusChange);
-  }
-
-  void _onFocusChange() {
-    // 失焦归一显示（2024 → 2024-01-01）；顺带刷新激活描边
-    if (!_focus.hasFocus) {
-      final n = normalizeYmd(_ctrl.text);
-      if (n != null && n != _ctrl.text) _ctrl.text = n;
+  Future<void> _pick() async {
+    final anchor = _anchorCtx;
+    if (!widget.enabled || anchor == null) return;
+    final d = await showDsDateDropdown(anchor, initial: parseYmd(widget.value));
+    if (d != null) {
+      widget.onChanged(formatYmd(d));
+      widget.onPicked?.call();
     }
-    if (mounted) setState(() {});
-  }
-
-  @override
-  void didUpdateWidget(DsDateCell old) {
-    super.didUpdateWidget(old);
-    // 仅在无焦点（非用户正在输入）时同步外部值，避免回流打断输入
-    if (!_focus.hasFocus &&
-        old.value != widget.value &&
-        (widget.value ?? '') != _ctrl.text) {
-      _ctrl.text = widget.value ?? '';
-    }
-  }
-
-  @override
-  void dispose() {
-    _removeOverlay();
-    _focus.removeListener(_onFocusChange);
-    _ownFocus?.dispose();
-    _ctrl.dispose();
-    super.dispose();
-  }
-
-  void _toggle() {
-    if (_open) {
-      _close();
-    } else {
-      _openOverlay();
-    }
-  }
-
-  void _openOverlay() {
-    if (_open || !widget.enabled) return;
-    final init = parseYmd(widget.value) ?? DateTime.now();
-    _entry = OverlayEntry(
-      builder: (_) => Positioned(
-        width: 248,
-        child: CompositedTransformFollower(
-          link: _link,
-          showWhenUnlinked: false,
-          targetAnchor: Alignment.bottomLeft,
-          followerAnchor: Alignment.topLeft,
-          offset: const Offset(0, 4),
-          child: TapRegion(
-            onTapOutside: (_) => _close(),
-            child: WheelDatePanel(
-              initial: init,
-              onCommit: (d) {
-                final v = formatYmd(d);
-                _ctrl.text = v;
-                widget.onChanged(v);
-                _close();
-                widget.onPicked?.call();
-              },
-            ),
-          ),
-        ),
-      ),
-    );
-    Overlay.of(context).insert(_entry!);
-    setState(() {});
-  }
-
-  void _close() {
-    _removeOverlay();
-    if (mounted) setState(() {});
-  }
-
-  void _removeOverlay() {
-    _entry?.remove();
-    _entry = null;
-  }
-
-  /// 提交键入值：归一 + 回写 + 推进下一格（Enter / 失焦走这里）。
-  void _commitTyped(String v) {
-    final n = normalizeYmd(v);
-    if (n != null) _ctrl.text = n;
-    widget.onChanged(n);
-    if (_open) _close();
-    widget.onPicked?.call();
   }
 
   @override
   Widget build(BuildContext context) {
     final t = context.tokens;
+    final has = widget.value != null && widget.value!.isNotEmpty;
     final height = widget.cell ? 32.0 : 38.0;
-    final active = _focus.hasFocus || _open;
-    return CompositedTransformTarget(
-      link: _link,
-      child: Focus(
-        // Tab/Esc 仍拦在外层（键盘流推进 / 收滚轮）；Enter 交给 TextField.onSubmitted
-        onKeyEvent: (node, e) {
-          if (e is! KeyDownEvent) return KeyEventResult.ignored;
-          final k = e.logicalKey;
-          if (k == LogicalKeyboardKey.escape) {
-            if (_open) {
-              _close();
-              return KeyEventResult.handled;
-            }
-            return KeyEventResult.ignored;
-          }
-          if (k == LogicalKeyboardKey.tab) {
-            final back = HardwareKeyboard.instance.isShiftPressed;
-            if (_open) _close();
-            final handled = widget.onTab?.call(backward: back) ?? false;
-            return handled ? KeyEventResult.handled : KeyEventResult.ignored;
-          }
-          return KeyEventResult.ignored;
-        },
-        child: Container(
-          height: height,
-          padding: const EdgeInsets.only(left: 10, right: 6),
-          decoration: BoxDecoration(
-            color: widget.cell
-                ? (active ? t.surface : Colors.transparent)
-                : t.surface,
-            border: Border.all(
-              color: widget.hasError
-                  ? t.danger
-                  : (active
-                      ? t.primary
-                      : (widget.cell ? Colors.transparent : t.border)),
+    return Focus(
+      focusNode: widget.focusNode,
+      onKeyEvent: (node, e) {
+        if (e is! KeyDownEvent) return KeyEventResult.ignored;
+        final k = e.logicalKey;
+        if (k == LogicalKeyboardKey.enter ||
+            k == LogicalKeyboardKey.numpadEnter ||
+            k == LogicalKeyboardKey.space) {
+          _pick();
+          return KeyEventResult.handled;
+        }
+        if (k == LogicalKeyboardKey.tab) {
+          final back = HardwareKeyboard.instance.isShiftPressed;
+          final handled = widget.onTab?.call(backward: back) ?? false;
+          return handled ? KeyEventResult.handled : KeyEventResult.ignored;
+        }
+        return KeyEventResult.ignored;
+      },
+      child: Builder(builder: (context) {
+        _anchorCtx = context;
+        final active = Focus.of(context).hasFocus;
+        return GestureDetector(
+          behavior: HitTestBehavior.opaque,
+          onTap: widget.enabled
+              ? () {
+                  widget.focusNode?.requestFocus();
+                  _pick();
+                }
+              : null,
+          child: Container(
+            height: height,
+            padding: const EdgeInsets.symmetric(horizontal: 10),
+            decoration: BoxDecoration(
+              color: widget.cell
+                  ? (active ? t.surface : Colors.transparent)
+                  : t.surface,
+              border: Border.all(
+                color: widget.hasError
+                    ? t.danger
+                    : (active
+                        ? t.primary
+                        : (widget.cell ? Colors.transparent : t.border)),
+              ),
+              borderRadius:
+                  BorderRadius.circular(widget.cell ? 5 : AppDims.rMd),
             ),
-            borderRadius: BorderRadius.circular(widget.cell ? 5 : AppDims.rMd),
-          ),
-          child: Row(children: [
-            Expanded(
-              child: TextField(
-                controller: _ctrl,
-                focusNode: _focus,
-                enabled: widget.enabled,
-                keyboardType: TextInputType.datetime,
-                style: TextStyle(
-                    fontSize: AppDims.fsBody,
-                    color: t.text,
-                    fontFamily: AppFonts.mono,
-                    fontFamilyFallback: AppFonts.monoFallback),
-                decoration: InputDecoration(
-                  isCollapsed: true,
-                  isDense: true,
-                  border: InputBorder.none,
-                  enabledBorder: InputBorder.none,
-                  focusedBorder: InputBorder.none,
-                  disabledBorder: InputBorder.none,
-                  filled: false,
-                  hintText: '年-月-日',
-                  hintStyle:
-                      TextStyle(fontSize: AppDims.fsBody, color: t.faint),
+            child: Row(children: [
+              Expanded(
+                child: Text(
+                  has ? widget.value! : '选择日期',
+                  overflow: TextOverflow.ellipsis,
+                  style: TextStyle(
+                      fontSize: AppDims.fsBody,
+                      color: has ? t.text : t.faint,
+                      fontFamily: has ? AppFonts.mono : null,
+                      fontFamilyFallback: has ? AppFonts.monoFallback : null),
                 ),
-                onChanged: (v) => widget.onChanged(normalizeYmd(v)),
-                onSubmitted: _commitTyped,
               ),
-            ),
-            InkWell(
-              onTap: widget.enabled
-                  ? () {
-                      _focus.requestFocus();
-                      _toggle();
-                    }
-                  : null,
-              borderRadius: BorderRadius.circular(AppDims.rSm),
-              child: Padding(
-                padding: const EdgeInsets.all(4),
-                child: Icon(LucideIcons.calendar, size: 15, color: t.faint),
-              ),
-            ),
-          ]),
-        ),
-      ),
+              Icon(LucideIcons.calendar, size: 15, color: t.faint),
+            ]),
+          ),
+        );
+      }),
     );
   }
 }