feat: Epic 1 completion - Marketing refactor met timeline en Bento Grid login

Epic 1 Stories (E1.S1 t/m E1.S6):

✨ E1.S1 - Verwijder EPD demo pagina
- Removed /epd route en credentials-box component
- Updated navigation: EPD Prototype → Login link
- Removed demo_users references from middleware en auth libs
- Cleaned up TypeScript errors in hero-section-2

✨ E1.S2 - Homepage vereenvoudigen
- Replaced lange manifesto (8000+ woorden) met statement section
- Added problem-solution-proof format (3 paragrafen)
- Removed comparison table, experiment CTA, manifesto content
- Timeline placeholder toegevoegd (completed in E1.S3)

✨ E1.S3 - Timeline component integreren
- Created BuildTimeline component (Aceternity UI pattern)
- Added timeline.json met 4 weken data (Week 1 completed)
- Features per week met icons, metrics, achievements
- Scroll-based animation met Framer Motion
- Responsive design (sticky titles, mobile/desktop layouts)

✨ E1.S4 - Timeline content structuur
- Structured JSON data in content/nl/timeline.json
- 15 Lucide icons voor feature types
- Week status badges (completed/in_progress/planned)
- Time savings display (< 5 sec vs 30 min)

✨ E1.S5 - Login pagina refactor
- Split-screen layout (60% features, 40% login)
- Teal gradient showcase met 4 feature cards
- Time savings badges per feature
- Responsive stack layout voor mobile
- Footer met AI Speedrun branding

✨ E1.S6 - Bento Grid showcase
- Replaced feature grid met Bento Grid layout
- Variable card sizes voor visual hierarchy (col-span-2, col-span-1)
- Dark slate background (from-slate-900)
- Gradient backgrounds per card (teal, amber, purple)
- Stats footer met 3 key metrics (90%+, < 5 sec, 4 weken)
- Hover animations en glassmorphism effects

🎨 Design System:
- Teal-first brand colors (#0D9488)
- Amber accents voor AI features (#F59E0B)
- Slate scale voor neutral colors
- WCAG AA compliant contrast

📦 Components:
- BuildTimeline (app/(marketing)/components)
- BentoGrid & BentoCard (components/ui)
- Button variants (components/ui)

📄 Content:
- timeline.json met volledige 4-weken data
- Features array per week
- Metrics en achievements tracking

🔧 Technical:
- Removed demo user scripts en migrations
- Updated middleware routes (removed /epd)
- TypeScript type fixes (hero-section-2, auth)
- Build succesvol: 13 routes generated

🚀 Generated with [Claude Code](https://claude.com/claude-code)

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

components/ui/button.tsx

@@ -0,0 +1,56 @@
+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 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",
+  {
+    variants: {
+      variant: {
+        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",
+      },
+      size: {
+        default: "h-10 px-4 py-2",
+        sm: "h-9 rounded-md px-3",
+        lg: "h-11 rounded-md px-8",
+        icon: "h-10 w-10",
+      },
+    },
+    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 }