feat(client): KPI 图标改用 lucide（与原型同源图形库）

原型图标源自 lucide-static（icons.js）。引入 lucide_icons_flutter 包，
库存屏 KPI 图标改 LucideIcons.box/database/box/triangleAlert，与原型一模一样
（不再用 Material 凑近似）。golden_harness 加载 Lucide package 字体（family 带
packages/ 前缀），golden 正确渲染。flutter test 242 通过。

后续：侧栏/顶栏/状态栏图标也逐步换 lucide（对照 shell.js）。

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

@@ -15,6 +15,7 @@ import '../../widgets/write_guard.dart';
 import '../../providers/inventory_provider.dart';
 import '../../widgets/data_table_card.dart';
 import '../../widgets/kpi_card.dart' show StatusPill; // 旧 tab/移动卡片用，待统一 DsBadge
+import 'package:lucide_icons_flutter/lucide_icons.dart';
 import '../../widgets/ds/ds_atoms.dart';
 import '../../widgets/ds/ds_kpi.dart';
 import '../../widgets/ds/ds_table.dart';
@@ -646,7 +647,7 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
                   title: 'SKU 总数',
                   value: NumberFormat.decimalPattern()
                       .format(summary?.skuCount ?? result.total),
-                  icon: Icons.inventory_2,
+                  icon: LucideIcons.box,
                   tone: DsKpiTone.info,
                   delta: '点击清筛选',
                   onTap: () {
@@ -666,7 +667,7 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
                 DsKpi(
                   title: '库存货值',
                   value: summary != null ? yuanWan(summary.stockValue) : '—',
-                  icon: Icons.savings_outlined,
+                  icon: LucideIcons.database,
                   tone: DsKpiTone.ok,
                   delta: '按进价',
                 ),
@@ -674,14 +675,14 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
                   title: '在库数量',
                   value: NumberFormat.decimalPattern()
                       .format((summary?.inStockQty ?? 0).round()),
-                  icon: Icons.warehouse_outlined,
+                  icon: LucideIcons.box,
                   tone: DsKpiTone.blue,
                   delta: '件',
                 ),
                 DsKpi(
                   title: '缺货预警',
                   value: '${summary?.shortageCount ?? 0}',
-                  icon: Icons.error_outline,
+                  icon: LucideIcons.triangleAlert,
                   tone: DsKpiTone.alert,
                   delta: (summary?.warningCount ?? 0) > 0
                       ? '需补货 ${summary!.warningCount} 项'

client/pubspec.lock

@@ -469,6 +469,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.3"
+  lucide_icons_flutter:
+    dependency: "direct main"
+    description:
+      name: lucide_icons_flutter
+      sha256: "7c5dc01a32a9905ae34e2d84224e92d6d0c42acf8926df9e01c35a1446bf1b69"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.14+2"
   matcher:
     dependency: transitive
     description:

client/pubspec.yaml

@@ -31,6 +31,7 @@ dependencies:
   ffi: ^2.1.3
   # GBK 编码（TSPL TEXT 内置中文字体需要），支持 macOS/Windows/Linux
   charset_converter: ^2.1.0
+  lucide_icons_flutter: ^3.1.14+2
 
 dev_dependencies:
   flutter_test:

client/test/support/golden_harness.dart

@@ -27,6 +27,14 @@ Future<void> ensureGoldenFonts() async {
       break;
     } catch (_) {/* 换下一个 asset key */}
   }
+  // lucide 图标字体（与原型同款图形库）。
+  try {
+    // package 字体在运行时 family 带 packages/<pkg>/ 前缀，FontLoader 须用全名。
+    final lucide = FontLoader('packages/lucide_icons_flutter/Lucide')
+      ..addFont(
+          rootBundle.load('packages/lucide_icons_flutter/assets/lucide.ttf'));
+    await lucide.load();
+  } catch (_) {/* 包未装时跳过 */}
   _fontsLoaded = true;
 }