feat(desktop): 工业化升级 A —— 设计系统地基（primitives + lucide + 语义令牌）

把"手搓内联 class + Unicode 字符图标"换成统一组件与真实图标，为后续工业化打底。

- 依赖：装 lucide-react（描线图标，按需 tree-shake）
- 令牌：tailwind.config 加语义色 brand/accent/success/warn/danger + 圆角档位；
  强调色字面量(violet/cyan/emerald…)收敛到令牌，便于整体换肤
- primitives（src/ui，零重依赖自建）：Button/Input/Textarea/Select/Field/Card/Panel/
  Badge/Dot/Tabs/Skeleton/EmptyState/Dialog/Toast(+useToast)/cn，桶文件统一引入
- 迁移：TopBar/LeftNav/BottomDrawer + Home/Report/Runs/Kb/Placeholder/ExecTrace/
  MemoryPanel/StudioView 全部换 primitives + lucide 图标；导航/能力卡/按钮告别
  ▤◆▣▦ 等 Unicode 字符；错误改用全局 Toast；空状态用 EmptyState
- App 包 ToastProvider

验证：tsc + vite build 通过；浏览器(Preview)走查工作台/报告页——真实图标、统一卡片/
按钮/输入；跑报告端到端正常（执行轨迹 lucide 状态图标点亮、章节耗时/字数/检索片段、
完成弹 Toast + 下载 Word）。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-desktop/frontend/package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.1.0",
       "dependencies": {
         "@xyflow/react": "^12.3.0",
+        "lucide-react": "^1.17.0",
         "react": "^19.0.0",
         "react-dom": "^19.0.0"
       },
@@ -2054,6 +2055,15 @@
         "yallist": "^3.0.2"
       }
     },
+    "node_modules/lucide-react": {
+      "version": "1.17.0",
+      "resolved": "https://registry.npmjs.org/lucide-react/-/lucide-react-1.17.0.tgz",
+      "integrity": "sha512-9FA9evdox/JQL5PT57fdA1x/yg8T7knJ98+zjTL3UfKza6pflQUUh3XtaQIHKvnsJw1lmsEyHVlt5jchYxOQ5w==",
+      "license": "ISC",
+      "peerDependencies": {
+        "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/merge2": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.4.1.tgz",