This is the initial push of the outline of the life dashboard

frontend/src/components/layout/Shell.tsx

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+import { Link, useLocation, useNavigate } from "react-router-dom";
+import {
+  LayoutDashboard,
+  Scale,
+  Dumbbell,
+  DollarSign,
+  LogOut,
+} from "lucide-react";
+import { clearToken } from "@/api/client";
+import { cn } from "@/lib/utils";
+
+const navItems = [
+  { to: "/", label: "Dashboard", icon: LayoutDashboard },
+  { to: "/weight", label: "Weight", icon: Scale },
+  { to: "/workouts", label: "Workouts", icon: Dumbbell },
+  { to: "/finances", label: "Finances", icon: DollarSign },
+];
+
+export function Shell({ children }: { children: React.ReactNode }) {
+  const location = useLocation();
+  const navigate = useNavigate();
+
+  const logout = () => {
+    clearToken();
+    navigate("/login");
+  };
+
+  return (
+    <div className="flex h-screen">
+      {/* Sidebar */}
+      <aside className="w-56 border-r bg-card flex flex-col">
+        <div className="p-4 border-b">
+          <h1 className="text-lg font-bold">Life Dashboard</h1>
+        </div>
+        <nav className="flex-1 p-2 space-y-1">
+          {navItems.map((item) => (
+            <Link
+              key={item.to}
+              to={item.to}
+              className={cn(
+                "flex items-center gap-3 px-3 py-2 rounded-md text-sm transition-colors",
+                location.pathname === item.to
+                  ? "bg-primary text-primary-foreground"
+                  : "hover:bg-accent"
+              )}
+            >
+              <item.icon className="h-4 w-4" />
+              {item.label}
+            </Link>
+          ))}
+        </nav>
+        <div className="p-2 border-t">
+          <button
+            onClick={logout}
+            className="flex items-center gap-3 px-3 py-2 rounded-md text-sm w-full hover:bg-accent transition-colors"
+          >
+            <LogOut className="h-4 w-4" />
+            Logout
+          </button>
+        </div>
+      </aside>
+
+      {/* Main content */}
+      <main className="flex-1 overflow-auto p-6">{children}</main>
+    </div>
+  );
+}

frontend/src/components/ui/button.tsx

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+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-md text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-50",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-primary-foreground shadow hover:bg-primary/90",
+        destructive:
+          "bg-destructive text-destructive-foreground shadow-sm hover:bg-destructive/90",
+        outline:
+          "border border-input bg-background shadow-sm hover:bg-accent hover:text-accent-foreground",
+        secondary:
+          "bg-secondary text-secondary-foreground shadow-sm hover:bg-secondary/80",
+        ghost: "hover:bg-accent hover:text-accent-foreground",
+        link: "text-primary underline-offset-4 hover:underline",
+      },
+      size: {
+        default: "h-9 px-4 py-2",
+        sm: "h-8 rounded-md px-3 text-xs",
+        lg: "h-10 rounded-md px-8",
+        icon: "h-9 w-9",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  }
+);
+
+export interface ButtonProps
+  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
+    VariantProps<typeof buttonVariants> {
+  asChild?: boolean;
+}
+
+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";
+
+export { Button, buttonVariants };

frontend/src/components/ui/card.tsx

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+import * as React from "react";
+import { cn } from "@/lib/utils";
+
+const Card = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div
+      ref={ref}
+      className={cn("rounded-lg border bg-card text-card-foreground shadow-sm", className)}
+      {...props}
+    />
+  )
+);
+Card.displayName = "Card";
+
+const CardHeader = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div ref={ref} className={cn("flex flex-col space-y-1.5 p-6", className)} {...props} />
+  )
+);
+CardHeader.displayName = "CardHeader";
+
+const CardTitle = React.forwardRef<HTMLParagraphElement, React.HTMLAttributes<HTMLHeadingElement>>(
+  ({ className, ...props }, ref) => (
+    <h3 ref={ref} className={cn("font-semibold leading-none tracking-tight", className)} {...props} />
+  )
+);
+CardTitle.displayName = "CardTitle";
+
+const CardContent = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div ref={ref} className={cn("p-6 pt-0", className)} {...props} />
+  )
+);
+CardContent.displayName = "CardContent";
+
+export { Card, CardHeader, CardTitle, CardContent };

frontend/src/components/ui/input.tsx

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+import * as React from "react";
+import { cn } from "@/lib/utils";
+
+const Input = React.forwardRef<HTMLInputElement, React.InputHTMLAttributes<HTMLInputElement>>(
+  ({ className, type, ...props }, ref) => {
+    return (
+      <input
+        type={type}
+        className={cn(
+          "flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-sm transition-colors file:border-0 file:bg-transparent file:text-sm file:font-medium placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:cursor-not-allowed disabled:opacity-50",
+          className
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  }
+);
+Input.displayName = "Input";
+
+export { Input };

frontend/src/components/ui/label.tsx

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+import * as React from "react";
+import * as LabelPrimitive from "@radix-ui/react-label";
+import { cn } from "@/lib/utils";
+
+const Label = React.forwardRef<
+  React.ElementRef<typeof LabelPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof LabelPrimitive.Root>
+>(({ className, ...props }, ref) => (
+  <LabelPrimitive.Root
+    ref={ref}
+    className={cn(
+      "text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70",
+      className
+    )}
+    {...props}
+  />
+));
+Label.displayName = LabelPrimitive.Root.displayName;
+
+export { Label };