diff --git a/client/package-lock.json b/client/package-lock.json
index 1b3f7361..54c97ff7 100644
--- a/client/package-lock.json
+++ b/client/package-lock.json
@@ -8,7 +8,12 @@
       "name": "client",
       "version": "0.1.0",
       "dependencies": {
+        "@radix-ui/react-dialog": "^1.1.15",
+        "@radix-ui/react-dropdown-menu": "^2.1.16",
+        "@radix-ui/react-slot": "^1.2.4",
+        "@radix-ui/react-tabs": "^1.1.13",
         "@tanstack/react-query": "^5.62.0",
+        "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
@@ -712,6 +717,44 @@
         "node": ">=12"
       }
     },
+    "node_modules/@floating-ui/core": {
+      "version": "1.7.4",
+      "resolved": "https://registry.npmjs.org/@floating-ui/core/-/core-1.7.4.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      }
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+    "node_modules/@floating-ui/dom": {
+      "version": "1.7.5",
+      "resolved": "https://registry.npmjs.org/@floating-ui/dom/-/dom-1.7.5.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "@floating-ui/utils": "^0.2.10"
+      }
+    },
+    "node_modules/@floating-ui/react-dom": {
+      "version": "2.1.7",
+      "resolved": "https://registry.npmjs.org/@floating-ui/react-dom/-/react-dom-2.1.7.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@floating-ui/dom": "^1.7.5"
+      },
+      "peerDependencies": {
+        "react": ">=16.8.0",
+        "react-dom": ">=16.8.0"
+      }
+    },
+    "node_modules/@floating-ui/utils": {
+      "version": "0.2.10",
+      "resolved": "https://registry.npmjs.org/@floating-ui/utils/-/utils-0.2.10.tgz",
+      "integrity": "sha512-aGTxbpbg8/b5JfU1HXSrbH3wXZuLPJcNEcZQFMxLs3oSzgtVu6nFPkbbGGUvBcUjKV2YyB9Wxxabo+HEH9tcRQ==",
+      "license": "MIT"
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -800,6 +843,677 @@
         "node": ">= 8"
       }
     },
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+      "resolved": "https://registry.npmjs.org/@radix-ui/primitive/-/primitive-1.1.3.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/@radix-ui/react-arrow": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/@radix-ui/react-arrow/-/react-arrow-1.1.7.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@radix-ui/react-primitive": "2.1.3"
+      },
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+    "node_modules/@radix-ui/react-collection": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/@radix-ui/react-collection/-/react-collection-1.1.7.tgz",
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+      }
+    },
     "node_modules/read-cache": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/read-cache/-/read-cache-1.0.0.tgz",
@@ -2630,6 +3452,12 @@
       "dev": true,
       "license": "Apache-2.0"
     },
+    "node_modules/tslib": {
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+      "license": "0BSD"
+    },
     "node_modules/typescript": {
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
@@ -2675,6 +3503,49 @@
         "browserslist": ">= 4.21.0"
       }
     },
+    "node_modules/use-callback-ref": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/use-callback-ref/-/use-callback-ref-1.3.3.tgz",
+      "integrity": "sha512-jQL3lRnocaFtu3V00JToYz/4QkNWswxijDaCVNZRiRTO3HQDLsdu1ZtmIUvV4yPp+rvWm5j0y0TG/S61cuijTg==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "peerDependencies": {
+        "@types/react": "*",
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/use-sidecar": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/use-sidecar/-/use-sidecar-1.1.3.tgz",
+      "integrity": "sha512-Fedw0aZvkhynoPYlA5WXrMCAMm+nSWdZt6lzJQ7Ok8S6Q+VsHmHpRWndVRJ8Be0ZbkfPc5LRYH+5XrzXcEeLRQ==",
+      "license": "MIT",
+      "dependencies": {
+        "detect-node-es": "^1.1.0",
+        "tslib": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "peerDependencies": {
+        "@types/react": "*",
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
diff --git a/client/package.json b/client/package.json
index ad2c99b6..184c097c 100644
--- a/client/package.json
+++ b/client/package.json
@@ -10,7 +10,12 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "@radix-ui/react-dialog": "^1.1.15",
+    "@radix-ui/react-dropdown-menu": "^2.1.16",
+    "@radix-ui/react-slot": "^1.2.4",
+    "@radix-ui/react-tabs": "^1.1.13",
     "@tanstack/react-query": "^5.62.0",
+    "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
diff --git a/client/src/components/ui/SOURCE.md b/client/src/components/ui/SOURCE.md
new file mode 100644
index 00000000..2c4bda5b
--- /dev/null
+++ b/client/src/components/ui/SOURCE.md
@@ -0,0 +1,25 @@
+# UI primitives（本地拷贝，单向同步）
+
+来源：shadcn/ui（MIT）+ Radix UI primitives（MIT）
+
+策略：本仓库内维护一份最小子集的 UI primitives（不做跨仓公共包），后续如需同步上游版本，按需人工比对合并。
+
+本次落地时间：2026-02-08
+
+文件清单：
+- `client/src/components/ui/button.tsx`
+- `client/src/components/ui/input.tsx`
+- `client/src/components/ui/label.tsx`
+- `client/src/components/ui/textarea.tsx`
+- `client/src/components/ui/card.tsx`
+- `client/src/components/ui/table.tsx`
+- `client/src/components/ui/tabs.tsx`
+- `client/src/components/ui/dialog.tsx`
+- `client/src/components/ui/dropdown-menu.tsx`
+- `client/src/lib/utils.ts`
+
+回滚路径：
+1) 删除 `client/src/components/ui/*` 与 `client/src/lib/utils.ts`
+2) 移除 `client/package.json` 中 Radix/CVA 相关依赖
+3) 逐页把 `Button/Input/...` 换回原生元素或 `btn-primary`/`btn-secondary`
+
diff --git a/client/src/components/ui/button.tsx b/client/src/components/ui/button.tsx
new file mode 100644
index 00000000..f651a48d
--- /dev/null
+++ b/client/src/components/ui/button.tsx
@@ -0,0 +1,51 @@
+import * as React from "react";
+import { Slot } from "@radix-ui/react-slot";
+import { cva, type VariantProps } from "class-variance-authority";
+import { cn } from "../../lib/utils";
+
+const buttonVariants = cva(
+  "inline-flex items-center justify-center whitespace-nowrap rounded-lg text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-200 disabled:pointer-events-none disabled:opacity-50",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-white hover:bg-primary-600",
+        secondary: "border border-slate-200 bg-white text-slate-700 hover:bg-slate-50",
+        outline: "border border-slate-200 bg-transparent text-slate-900 hover:bg-slate-50",
+        destructive: "bg-red-600 text-white hover:bg-red-700",
+        ghost: "bg-transparent text-slate-700 hover:bg-slate-100",
+        link: "bg-transparent text-primary underline-offset-4 hover:underline",
+      },
+      size: {
+        default: "h-11 px-4",
+        sm: "h-10 rounded-md px-3 text-xs",
+        lg: "h-12 rounded-xl px-6 text-base",
+        icon: "h-11 w-11 p-0",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  },
+);
+
+export type ButtonProps = React.ButtonHTMLAttributes<HTMLButtonElement> &
+  VariantProps<typeof buttonVariants> & {
+    asChild?: boolean;
+  };
+
+export const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, variant, size, asChild = false, ...props }, ref) => {
+    const Comp = asChild ? Slot : "button";
+    return (
+      <Comp
+        className={cn(buttonVariants({ variant, size, className }))}
+        ref={ref}
+        {...props}
+      />
+    );
+  },
+);
+
+Button.displayName = "Button";
+
diff --git a/client/src/components/ui/card.tsx b/client/src/components/ui/card.tsx
new file mode 100644
index 00000000..cdd2d7ef
--- /dev/null
+++ b/client/src/components/ui/card.tsx
@@ -0,0 +1,57 @@
+import * as React from "react";
+import { cn } from "../../lib/utils";
+
+export const Card = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => {
+    return (
+      <div
+        ref={ref}
+        className={cn("rounded-xl border border-slate-200 bg-white shadow-sm", className)}
+        {...props}
+      />
+    );
+  },
+);
+
+Card.displayName = "Card";
+
+export const CardHeader = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => {
+  return <div ref={ref} className={cn("p-6 pb-0", className)} {...props} />;
+});
+
+CardHeader.displayName = "CardHeader";
+
+export const CardContent = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => {
+  return <div ref={ref} className={cn("p-6", className)} {...props} />;
+});
+
+CardContent.displayName = "CardContent";
+
+export const CardTitle = React.forwardRef<
+  HTMLParagraphElement,
+  React.HTMLAttributes<HTMLHeadingElement>
+>(({ className, ...props }, ref) => {
+  return (
+    <h3 ref={ref} className={cn("text-base font-semibold text-slate-900", className)} {...props} />
+  );
+});
+
+CardTitle.displayName = "CardTitle";
+
+export const CardDescription = React.forwardRef<
+  HTMLParagraphElement,
+  React.HTMLAttributes<HTMLParagraphElement>
+>(({ className, ...props }, ref) => {
+  return (
+    <p ref={ref} className={cn("text-sm text-slate-600", className)} {...props} />
+  );
+});
+
+CardDescription.displayName = "CardDescription";
+
diff --git a/client/src/components/ui/dialog.tsx b/client/src/components/ui/dialog.tsx
new file mode 100644
index 00000000..a6a29293
--- /dev/null
+++ b/client/src/components/ui/dialog.tsx
@@ -0,0 +1,76 @@
+import * as React from "react";
+import * as DialogPrimitive from "@radix-ui/react-dialog";
+import { cn } from "../../lib/utils";
+
+export const Dialog = DialogPrimitive.Root;
+export const DialogTrigger = DialogPrimitive.Trigger;
+export const DialogClose = DialogPrimitive.Close;
+
+export const DialogPortal = DialogPrimitive.Portal;
+
+export const DialogOverlay = React.forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Overlay>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Overlay>
+>(({ className, ...props }, ref) => (
+  <DialogPrimitive.Overlay
+    ref={ref}
+    className={cn("fixed inset-0 z-50 bg-black/40 backdrop-blur-sm", className)}
+    {...props}
+  />
+));
+
+DialogOverlay.displayName = "DialogOverlay";
+
+export const DialogContent = React.forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Content>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Content>
+>(({ className, ...props }, ref) => (
+  <DialogPortal>
+    <DialogOverlay />
+    <DialogPrimitive.Content
+      ref={ref}
+      className={cn(
+        "fixed left-1/2 top-1/2 z-50 w-[92vw] max-w-lg -translate-x-1/2 -translate-y-1/2 rounded-xl border border-slate-200 bg-white p-6 shadow-lg focus-visible:outline-none",
+        className,
+      )}
+      {...props}
+    />
+  </DialogPortal>
+));
+
+DialogContent.displayName = "DialogContent";
+
+export const DialogHeader = ({ className, ...props }: React.HTMLAttributes<HTMLDivElement>) => (
+  <div className={cn("flex flex-col gap-1.5 text-center sm:text-left", className)} {...props} />
+);
+
+export const DialogFooter = ({ className, ...props }: React.HTMLAttributes<HTMLDivElement>) => (
+  <div className={cn("mt-5 flex flex-col-reverse gap-2 sm:flex-row sm:justify-end", className)} {...props} />
+);
+
+export const DialogTitle = React.forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Title>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Title>
+>(({ className, ...props }, ref) => (
+  <DialogPrimitive.Title
+    ref={ref}
+    className={cn("text-lg font-semibold text-slate-900", className)}
+    {...props}
+  />
+));
+
+DialogTitle.displayName = "DialogTitle";
+
+export const DialogDescription = React.forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Description>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Description>
+>(({ className, ...props }, ref) => (
+  <DialogPrimitive.Description
+    ref={ref}
+    className={cn("text-sm text-slate-600", className)}
+    {...props}
+  />
+));
+
+DialogDescription.displayName = "DialogDescription";
+
diff --git a/client/src/components/ui/dropdown-menu.tsx b/client/src/components/ui/dropdown-menu.tsx
new file mode 100644
index 00000000..b79afccc
--- /dev/null
+++ b/client/src/components/ui/dropdown-menu.tsx
@@ -0,0 +1,54 @@
+import * as React from "react";
+import * as DropdownMenuPrimitive from "@radix-ui/react-dropdown-menu";
+import { cn } from "../../lib/utils";
+
+export const DropdownMenu = DropdownMenuPrimitive.Root;
+export const DropdownMenuTrigger = DropdownMenuPrimitive.Trigger;
+export const DropdownMenuContent = React.forwardRef<
+  React.ElementRef<typeof DropdownMenuPrimitive.Content>,
+  React.ComponentPropsWithoutRef<typeof DropdownMenuPrimitive.Content>
+>(({ className, sideOffset = 8, ...props }, ref) => (
+  <DropdownMenuPrimitive.Portal>
+    <DropdownMenuPrimitive.Content
+      ref={ref}
+      sideOffset={sideOffset}
+      className={cn(
+        "z-50 min-w-[12rem] overflow-hidden rounded-xl border border-slate-200 bg-white p-1 text-slate-900 shadow-md",
+        className,
+      )}
+      {...props}
+    />
+  </DropdownMenuPrimitive.Portal>
+));
+
+DropdownMenuContent.displayName = "DropdownMenuContent";
+
+export const DropdownMenuItem = React.forwardRef<
+  React.ElementRef<typeof DropdownMenuPrimitive.Item>,
+  React.ComponentPropsWithoutRef<typeof DropdownMenuPrimitive.Item>
+>(({ className, ...props }, ref) => (
+  <DropdownMenuPrimitive.Item
+    ref={ref}
+    className={cn(
+      "flex cursor-default select-none items-center rounded-lg px-3 py-2 text-sm outline-none focus:bg-slate-100 data-[disabled]:pointer-events-none data-[disabled]:opacity-50",
+      className,
+    )}
+    {...props}
+  />
+));
+
+DropdownMenuItem.displayName = "DropdownMenuItem";
+
+export const DropdownMenuSeparator = React.forwardRef<
+  React.ElementRef<typeof DropdownMenuPrimitive.Separator>,
+  React.ComponentPropsWithoutRef<typeof DropdownMenuPrimitive.Separator>
+>(({ className, ...props }, ref) => (
+  <DropdownMenuPrimitive.Separator
+    ref={ref}
+    className={cn("-mx-1 my-1 h-px bg-slate-200", className)}
+    {...props}
+  />
+));
+
+DropdownMenuSeparator.displayName = "DropdownMenuSeparator";
+
diff --git a/client/src/components/ui/input.tsx b/client/src/components/ui/input.tsx
new file mode 100644
index 00000000..c7309107
--- /dev/null
+++ b/client/src/components/ui/input.tsx
@@ -0,0 +1,23 @@
+import * as React from "react";
+import { cn } from "../../lib/utils";
+
+export type InputProps = React.InputHTMLAttributes<HTMLInputElement>;
+
+export const Input = React.forwardRef<HTMLInputElement, InputProps>(
+  ({ className, type, ...props }, ref) => {
+    return (
+      <input
+        type={type}
+        className={cn(
+          "flex h-11 w-full rounded-lg border border-slate-300 bg-white px-3 py-2 text-sm text-slate-900 placeholder:text-slate-400 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-200 disabled:cursor-not-allowed disabled:opacity-50",
+          className,
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  },
+);
+
+Input.displayName = "Input";
+
diff --git a/client/src/components/ui/label.tsx b/client/src/components/ui/label.tsx
new file mode 100644
index 00000000..9498d59c
--- /dev/null
+++ b/client/src/components/ui/label.tsx
@@ -0,0 +1,14 @@
+import * as React from "react";
+import { cn } from "../../lib/utils";
+
+export type LabelProps = React.LabelHTMLAttributes<HTMLLabelElement>;
+
+export function Label({ className, ...props }: LabelProps) {
+  return (
+    <label
+      className={cn("text-sm font-medium leading-none text-slate-800", className)}
+      {...props}
+    />
+  );
+}
+
diff --git a/client/src/components/ui/table.tsx b/client/src/components/ui/table.tsx
new file mode 100644
index 00000000..21d1cdaa
--- /dev/null
+++ b/client/src/components/ui/table.tsx
@@ -0,0 +1,59 @@
+import * as React from "react";
+import { cn } from "../../lib/utils";
+
+export const Table = React.forwardRef<HTMLTableElement, React.HTMLAttributes<HTMLTableElement>>(
+  ({ className, ...props }, ref) => (
+    <div className="w-full overflow-auto">
+      <table ref={ref} className={cn("w-full caption-bottom text-sm", className)} {...props} />
+    </div>
+  ),
+);
+
+Table.displayName = "Table";
+
+export const TableHeader = React.forwardRef<
+  HTMLTableSectionElement,
+  React.HTMLAttributes<HTMLTableSectionElement>
+>(({ className, ...props }, ref) => (
+  <thead ref={ref} className={cn("bg-slate-50 text-slate-600", className)} {...props} />
+));
+
+TableHeader.displayName = "TableHeader";
+
+export const TableBody = React.forwardRef<
+  HTMLTableSectionElement,
+  React.HTMLAttributes<HTMLTableSectionElement>
+>(({ className, ...props }, ref) => (
+  <tbody ref={ref} className={cn("[&_tr:last-child]:border-0", className)} {...props} />
+));
+
+TableBody.displayName = "TableBody";
+
+export const TableRow = React.forwardRef<HTMLTableRowElement, React.HTMLAttributes<HTMLTableRowElement>>(
+  ({ className, ...props }, ref) => (
+    <tr ref={ref} className={cn("border-t border-slate-100", className)} {...props} />
+  ),
+);
+
+TableRow.displayName = "TableRow";
+
+export const TableHead = React.forwardRef<HTMLTableCellElement, React.ThHTMLAttributes<HTMLTableCellElement>>(
+  ({ className, ...props }, ref) => (
+    <th
+      ref={ref}
+      className={cn("h-10 px-3 text-left align-middle font-medium text-slate-600", className)}
+      {...props}
+    />
+  ),
+);
+
+TableHead.displayName = "TableHead";
+
+export const TableCell = React.forwardRef<HTMLTableCellElement, React.TdHTMLAttributes<HTMLTableCellElement>>(
+  ({ className, ...props }, ref) => (
+    <td ref={ref} className={cn("px-3 py-2 align-middle", className)} {...props} />
+  ),
+);
+
+TableCell.displayName = "TableCell";
+
diff --git a/client/src/components/ui/tabs.tsx b/client/src/components/ui/tabs.tsx
new file mode 100644
index 00000000..f2fa9bec
--- /dev/null
+++ b/client/src/components/ui/tabs.tsx
@@ -0,0 +1,51 @@
+import * as React from "react";
+import * as TabsPrimitive from "@radix-ui/react-tabs";
+import { cn } from "../../lib/utils";
+
+export const Tabs = TabsPrimitive.Root;
+
+export const TabsList = React.forwardRef<
+  React.ElementRef<typeof TabsPrimitive.List>,
+  React.ComponentPropsWithoutRef<typeof TabsPrimitive.List>
+>(({ className, ...props }, ref) => (
+  <TabsPrimitive.List
+    ref={ref}
+    className={cn(
+      "inline-flex h-11 items-center justify-center rounded-lg border border-slate-200 bg-white p-1 text-slate-700",
+      className,
+    )}
+    {...props}
+  />
+));
+
+TabsList.displayName = "TabsList";
+
+export const TabsTrigger = React.forwardRef<
+  React.ElementRef<typeof TabsPrimitive.Trigger>,
+  React.ComponentPropsWithoutRef<typeof TabsPrimitive.Trigger>
+>(({ className, ...props }, ref) => (
+  <TabsPrimitive.Trigger
+    ref={ref}
+    className={cn(
+      "inline-flex h-9 items-center justify-center whitespace-nowrap rounded-md px-3 text-sm font-medium transition-all focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-200 data-[state=active]:bg-primary data-[state=active]:text-white",
+      className,
+    )}
+    {...props}
+  />
+));
+
+TabsTrigger.displayName = "TabsTrigger";
+
+export const TabsContent = React.forwardRef<
+  React.ElementRef<typeof TabsPrimitive.Content>,
+  React.ComponentPropsWithoutRef<typeof TabsPrimitive.Content>
+>(({ className, ...props }, ref) => (
+  <TabsPrimitive.Content
+    ref={ref}
+    className={cn("mt-4 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-200", className)}
+    {...props}
+  />
+));
+
+TabsContent.displayName = "TabsContent";
+
diff --git a/client/src/components/ui/textarea.tsx b/client/src/components/ui/textarea.tsx
new file mode 100644
index 00000000..29807986
--- /dev/null
+++ b/client/src/components/ui/textarea.tsx
@@ -0,0 +1,22 @@
+import * as React from "react";
+import { cn } from "../../lib/utils";
+
+export type TextareaProps = React.TextareaHTMLAttributes<HTMLTextAreaElement>;
+
+export const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(
+  ({ className, ...props }, ref) => {
+    return (
+      <textarea
+        className={cn(
+          "flex min-h-[120px] w-full rounded-lg border border-slate-300 bg-white px-3 py-2 text-sm text-slate-900 placeholder:text-slate-400 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-200 disabled:cursor-not-allowed disabled:opacity-50",
+          className,
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  },
+);
+
+Textarea.displayName = "Textarea";
+
diff --git a/client/src/index.css b/client/src/index.css
index 057ba164..c32e33bf 100644
--- a/client/src/index.css
+++ b/client/src/index.css
@@ -5,6 +5,7 @@
 */
 
 @import url("https://fonts.googleapis.com/css2?family=Public+Sans:wght@400;500;700;900&display=swap");
+@import "./styles/mobile-touch.css";
 
 @tailwind base;
 @tailwind components;
diff --git a/client/src/lib/utils.ts b/client/src/lib/utils.ts
new file mode 100644
index 00000000..6fcf374b
--- /dev/null
+++ b/client/src/lib/utils.ts
@@ -0,0 +1,7 @@
+import { clsx, type ClassValue } from "clsx";
+import { twMerge } from "tailwind-merge";
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs));
+}
+
diff --git a/client/src/styles/mobile-touch.css b/client/src/styles/mobile-touch.css
new file mode 100644
index 00000000..e0a2d931
--- /dev/null
+++ b/client/src/styles/mobile-touch.css
@@ -0,0 +1,8 @@
+/* Mobile touch target baseline (44px).
+   Keep it as a lightweight opt-in class to avoid breaking desktop layouts. */
+
+.touch-target {
+  min-height: 44px;
+  min-width: 44px;
+}
+
diff --git a/issues/2026-02-08_21-50-09-p4-trialrun-ready.csv b/issues/2026-02-08_21-50-09-p4-trialrun-ready.csv
index 4e4884fa..5ca3a396 100644
--- a/issues/2026-02-08_21-50-09-p4-trialrun-ready.csv
+++ b/issues/2026-02-08_21-50-09-p4-trialrun-ready.csv
@@ -1,6 +1,6 @@
 ID,Title,Description,Acceptance,Test_Method,Tools,Dev_Status,Review1_Status,Regression_Status,Files,Dependencies,Notes
 E1,CSV快照收口（试运行上线版）,新建P4试运行上线版执行合同快照承接全部前后端与联动工作,新CSV通过校验且依赖关系正确旧快照不改动,python3 /home/shunli/.codex/skills/plan/scripts/validate_issues_csv.py issues/2026-02-08_21-50-09-p4-trialrun-ready.csv,manual,DONE,DONE,DONE,issues/2026-02-08_21-50-09-p4-trialrun-ready.csv,[],none
-E2,前端UI组件基线（成熟复用）,引入UI primitives与移动端44px触控规范并保持现有token策略,三大业务页可复用组件且typecheck与build通过,cd client && npm run typecheck && npm run build,manual,TODO,TODO,TODO,client/src/components/ui/* | client/src/lib/* | client/src/styles/mobile-touch.css | client/src/index.css | client/tailwind.config.js | client/package.json,"[""E1""]",本地拷贝shadcn风格组件子集并记录来源/许可证与回滚路径
+E2,前端UI组件基线（成熟复用）,引入UI primitives与移动端44px触控规范并保持现有token策略,三大业务页可复用组件且typecheck与build通过,cd client && npm run typecheck && npm run build,manual,DONE,DONE,DONE,client/src/components/ui/* | client/src/lib/* | client/src/styles/mobile-touch.css | client/src/index.css | client/tailwind.config.js | client/package.json,"[""E1""]",本地拷贝shadcn风格组件子集并记录来源/许可证与回滚路径
 E3,前端布局导航收敛,统一Sidebar与Topbar交互视觉响应式与权限菜单体验,四角色菜单正确窄屏可用路由守卫无闪烁,"manual: 按server与client README启动联调并验证employee manager finance finance_mgr菜单与守卫",manual,TODO,TODO,TODO,client/src/layouts/AppShellLayout.tsx | client/src/components/navigation/* | client/src/components/common/PageHeader.tsx | client/src/router/*,"[""E2""]",none
 E4,待办页精修（列表详情动作）,用UI primitives收敛待办列表与详情动作区统一加载空态错误并补data-testid,approve reject return transfer动作可用且动作后列表详情刷新一致,cd client && npm run typecheck && npm run build,manual,TODO,TODO,TODO,client/src/pages/WorkflowTasksPage.tsx | client/src/pages/WorkflowTaskDetailPage.tsx | client/src/api/workflow.ts,"[""E3""]",为E2E补稳定选择器data-testid
 E5,报销页精修（列表详情联动）,收敛报销列表详情展示并优化支付凭证与票据区块一致性并补data-testid,employee可create submit withdraw且finance可pay并填写凭证字段,cd client && npm run typecheck && npm run build,manual,TODO,TODO,TODO,client/src/pages/ReimbursementsPage.tsx | client/src/pages/ReimbursementDetailPage.tsx | client/src/api/reimbursements.ts,"[""E3""]",为E2E补稳定选择器data-testid