feat: setup frontend project with bun and dynamic data fetching

- Create new frontend project directory with Next.js 15 + React 19
- Migrate from pnpm to bun for faster package management
- Add TanStack Query + Axios for dynamic data fetching
- Create comprehensive Makefile with development commands
- Setup API layer with query hooks and error handling
- Configure environment variables and bun settings
- Add TypeScript type checking and project documentation
- Update CLAUDE.md with bun-specific development workflow

frontend/components/ui/toggle-group.tsx

@@ -0,0 +1,61 @@
+"use client"
+
+import * as React from "react"
+import * as ToggleGroupPrimitive from "@radix-ui/react-toggle-group"
+import { type VariantProps } from "class-variance-authority"
+
+import { cn } from "@/lib/utils"
+import { toggleVariants } from "@/components/ui/toggle"
+
+const ToggleGroupContext = React.createContext<
+  VariantProps<typeof toggleVariants>
+>({
+  size: "default",
+  variant: "default",
+})
+
+const ToggleGroup = React.forwardRef<
+  React.ElementRef<typeof ToggleGroupPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof ToggleGroupPrimitive.Root> &
+    VariantProps<typeof toggleVariants>
+>(({ className, variant, size, children, ...props }, ref) => (
+  <ToggleGroupPrimitive.Root
+    ref={ref}
+    className={cn("flex items-center justify-center gap-1", className)}
+    {...props}
+  >
+    <ToggleGroupContext.Provider value={{ variant, size }}>
+      {children}
+    </ToggleGroupContext.Provider>
+  </ToggleGroupPrimitive.Root>
+))
+
+ToggleGroup.displayName = ToggleGroupPrimitive.Root.displayName
+
+const ToggleGroupItem = React.forwardRef<
+  React.ElementRef<typeof ToggleGroupPrimitive.Item>,
+  React.ComponentPropsWithoutRef<typeof ToggleGroupPrimitive.Item> &
+    VariantProps<typeof toggleVariants>
+>(({ className, children, variant, size, ...props }, ref) => {
+  const context = React.useContext(ToggleGroupContext)
+
+  return (
+    <ToggleGroupPrimitive.Item
+      ref={ref}
+      className={cn(
+        toggleVariants({
+          variant: context.variant || variant,
+          size: context.size || size,
+        }),
+        className
+      )}
+      {...props}
+    >
+      {children}
+    </ToggleGroupPrimitive.Item>
+  )
+})
+
+ToggleGroupItem.displayName = ToggleGroupPrimitive.Item.displayName
+
+export { ToggleGroup, ToggleGroupItem }