frontend: add MagicUI dock component

- Install dock component via shadcn
- Fix import path from motion/react to framer-motion

frontend/components/ui/dock.tsx

@@ -0,0 +1,155 @@
+"use client"
+
+import React, { PropsWithChildren, useRef } from "react"
+import { cva, type VariantProps } from "class-variance-authority"
+import {
+  motion,
+  MotionValue,
+  useMotionValue,
+  useSpring,
+  useTransform,
+} from "framer-motion"
+import type { MotionProps } from "framer-motion"
+
+import { cn } from "@/lib/utils"
+
+export interface DockProps extends VariantProps<typeof dockVariants> {
+  className?: string
+  iconSize?: number
+  iconMagnification?: number
+  disableMagnification?: boolean
+  iconDistance?: number
+  direction?: "top" | "middle" | "bottom"
+  children: React.ReactNode
+}
+
+const DEFAULT_SIZE = 40
+const DEFAULT_MAGNIFICATION = 60
+const DEFAULT_DISTANCE = 140
+const DEFAULT_DISABLEMAGNIFICATION = false
+
+const dockVariants = cva(
+  "supports-backdrop-blur:bg-white/10 supports-backdrop-blur:dark:bg-black/10 mx-auto mt-8 flex h-[58px] w-max items-center justify-center gap-2 rounded-2xl border p-2 backdrop-blur-md"
+)
+
+const Dock = React.forwardRef<HTMLDivElement, DockProps>(
+  (
+    {
+      className,
+      children,
+      iconSize = DEFAULT_SIZE,
+      iconMagnification = DEFAULT_MAGNIFICATION,
+      disableMagnification = DEFAULT_DISABLEMAGNIFICATION,
+      iconDistance = DEFAULT_DISTANCE,
+      direction = "middle",
+      ...props
+    },
+    ref
+  ) => {
+    const mouseX = useMotionValue(Infinity)
+
+    const renderChildren = () => {
+      return React.Children.map(children, (child) => {
+        if (
+          React.isValidElement<DockIconProps>(child) &&
+          child.type === DockIcon
+        ) {
+          return React.cloneElement(child, {
+            ...child.props,
+            mouseX: mouseX,
+            size: iconSize,
+            magnification: iconMagnification,
+            disableMagnification: disableMagnification,
+            distance: iconDistance,
+          })
+        }
+        return child
+      })
+    }
+
+    return (
+      <motion.div
+        ref={ref}
+        onMouseMove={(e) => mouseX.set(e.pageX)}
+        onMouseLeave={() => mouseX.set(Infinity)}
+        {...props}
+        className={cn(dockVariants({ className }), {
+          "items-start": direction === "top",
+          "items-center": direction === "middle",
+          "items-end": direction === "bottom",
+        })}
+      >
+        {renderChildren()}
+      </motion.div>
+    )
+  }
+)
+
+Dock.displayName = "Dock"
+
+export interface DockIconProps extends Omit<
+  MotionProps & React.HTMLAttributes<HTMLDivElement>,
+  "children"
+> {
+  size?: number
+  magnification?: number
+  disableMagnification?: boolean
+  distance?: number
+  mouseX?: MotionValue<number>
+  className?: string
+  children?: React.ReactNode
+  props?: PropsWithChildren
+}
+
+const DockIcon = ({
+  size = DEFAULT_SIZE,
+  magnification = DEFAULT_MAGNIFICATION,
+  disableMagnification,
+  distance = DEFAULT_DISTANCE,
+  mouseX,
+  className,
+  children,
+  ...props
+}: DockIconProps) => {
+  const ref = useRef<HTMLDivElement>(null)
+  const padding = Math.max(6, size * 0.2)
+  const defaultMouseX = useMotionValue(Infinity)
+
+  const distanceCalc = useTransform(mouseX ?? defaultMouseX, (val: number) => {
+    const bounds = ref.current?.getBoundingClientRect() ?? { x: 0, width: 0 }
+    return val - bounds.x - bounds.width / 2
+  })
+
+  const targetSize = disableMagnification ? size : magnification
+
+  const sizeTransform = useTransform(
+    distanceCalc,
+    [-distance, 0, distance],
+    [size, targetSize, size]
+  )
+
+  const scaleSize = useSpring(sizeTransform, {
+    mass: 0.1,
+    stiffness: 150,
+    damping: 12,
+  })
+
+  return (
+    <motion.div
+      ref={ref}
+      style={{ width: scaleSize, height: scaleSize, padding }}
+      className={cn(
+        "flex aspect-square cursor-pointer items-center justify-center rounded-full",
+        disableMagnification && "hover:bg-muted-foreground transition-colors",
+        className
+      )}
+      {...props}
+    >
+      <div>{children}</div>
+    </motion.div>
+  )
+}
+
+DockIcon.displayName = "DockIcon"
+
+export { Dock, DockIcon, dockVariants }