feat(auth): implement email/password login form

apps/web/src/common/components/ui/button.tsx

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+import * as React from "react"
+
+export interface ButtonProps
+  extends React.ButtonHTMLAttributes<HTMLButtonElement> {
+  variant?: "default" | "destructive" | "outline" | "secondary" | "ghost" | "link"
+  size?: "default" | "sm" | "lg" | "icon"
+}
+
+const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, variant = "default", size = "default", ...props }, ref) => {
+    const baseStyles = "inline-flex items-center justify-center whitespace-nowrap rounded-md text-sm font-medium ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50"
+    
+    const variants = {
+      default: "bg-primary text-primary-foreground hover:bg-primary/90",
+      destructive: "bg-destructive text-destructive-foreground hover:bg-destructive/90",
+      outline: "border border-input bg-background hover:bg-accent hover:text-accent-foreground",
+      secondary: "bg-secondary text-secondary-foreground hover:bg-secondary/80",
+      ghost: "hover:bg-accent hover:text-accent-foreground",
+      link: "text-primary underline-offset-4 hover:underline",
+    }
+
+    const sizes = {
+      default: "h-10 px-4 py-2",
+      sm: "h-9 rounded-md px-3 text-xs",
+      lg: "h-11 rounded-md px-8",
+      icon: "h-10 w-10",
+    }
+
+    return (
+      <button
+        className={`${baseStyles} ${variants[variant]} ${sizes[size]} ${className || ''}`}
+        ref={ref}
+        {...props}
+      />
+    )
+  }
+)
+Button.displayName = "Button"
+
+export { Button }

apps/web/src/common/components/ui/input.tsx

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+import * as React from "react"
+
+export interface InputProps
+  extends React.InputHTMLAttributes<HTMLInputElement> {}
+
+const Input = React.forwardRef<HTMLInputElement, InputProps>(
+  ({ className, type, ...props }, ref) => (
+    <input
+      type={type}
+      className={`flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-base ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 md:text-sm transition-colors ${className || ''}`}
+      ref={ref}
+      {...props}
+    />
+  )
+)
+Input.displayName = "Input"
+
+export { Input }

apps/web/src/common/components/ui/label.tsx

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