feat: Implement blue theme with modern design

- Add Inter font from Google Fonts for modern typography
- Implement blue theme from shadcn.com (primary: blue)
- Add beautiful hero header with car icon
- Create Separator component for visual division
- Increase card padding (p-8) for better breathing room
- Larger card titles (text-2xl) for better hierarchy
- Improved spacing throughout (gap-8, py-12, etc.)
- Blue primary color (#3B82F6) with proper foregrounds
- Professional, modern look matching shadcn.com aesthetic

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

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

frontend/components/ui/separator.tsx

@@ -0,0 +1,29 @@
+import * as React from "react"
+import * as SeparatorPrimitive from "@radix-ui/react-separator"
+
+import { cn } from "@/lib/utils"
+
+const Separator = React.forwardRef<
+  React.ElementRef<typeof SeparatorPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof SeparatorPrimitive.Root>
+>(
+  (
+    { className, orientation = "horizontal", decorative = true, ...props },
+    ref
+  ) => (
+    <SeparatorPrimitive.Root
+      ref={ref}
+      decorative={decorative}
+      orientation={orientation}
+      className={cn(
+        "shrink-0 bg-border",
+        orientation === "horizontal" ? "h-[1px] w-full" : "h-full w-[1px]",
+        className
+      )}
+      {...props}
+    />
+  )
+)
+Separator.displayName = SeparatorPrimitive.Root.displayName
+
+export { Separator }