feat: create ScreenshotLightbox component with zoom/pan and navigation (Task 1.1)

components/ui/screenshot-lightbox.tsx

@@ -0,0 +1,127 @@
+// components/ui/screenshot-lightbox.tsx
+"use client"
+
+import { useState, useCallback, useEffect } from "react"
+import { AnimatePresence, motion } from "motion/react"
+import { XIcon, ChevronLeftIcon, ChevronRightIcon } from "lucide-react"
+
+interface ScreenshotLightboxProps {
+  screenshots: Array<{ id: string; url: string; width: number; height: number }>
+  initialIndex: number
+  onClose: () => void
+}
+
+export function ScreenshotLightbox({
+  screenshots,
+  initialIndex,
+  onClose,
+}: ScreenshotLightboxProps) {
+  const [currentIndex, setCurrentIndex] = useState(initialIndex)
+  const [zoomed, setZoomed] = useState(false)
+  const hasMultiple = screenshots.length > 1
+
+  const goNext = useCallback(() => {
+    setZoomed(false)
+    setCurrentIndex((prev) => (prev < screenshots.length - 1 ? prev + 1 : prev))
+  }, [screenshots.length])
+
+  const goPrev = useCallback(() => {
+    setZoomed(false)
+    setCurrentIndex((prev) => (prev > 0 ? prev - 1 : prev))
+  }, [])
+
+  const toggleZoom = useCallback(() => {
+    setZoomed((z) => !z)
+  }, [])
+
+  // Keyboard handlers
+  useEffect(() => {
+    function handleKeyDown(e: KeyboardEvent) {
+      if (e.key === "Escape") {
+        onClose()
+      } else if (e.key === "ArrowRight" && hasMultiple) {
+        goNext()
+      } else if (e.key === "ArrowLeft" && hasMultiple) {
+        goPrev()
+      }
+    }
+    window.addEventListener("keydown", handleKeyDown)
+    return () => window.removeEventListener("keydown", handleKeyDown)
+  }, [onClose, goNext, goPrev, hasMultiple])
+
+  const current = screenshots[currentIndex]
+  if (!current) return null
+
+  return (
+    <AnimatePresence>
+      <motion.div
+        key="lightbox-backdrop"
+        className="fixed inset-0 z-[60] bg-black/90 flex items-center justify-center"
+        initial={{ opacity: 0 }}
+        animate={{ opacity: 1 }}
+        exit={{ opacity: 0 }}
+        onClick={(e) => {
+          if (e.target === e.currentTarget) onClose()
+        }}
+      >
+        {/* Close button */}
+        <button
+          onClick={onClose}
+          className="absolute top-4 right-4 p-2 rounded-full bg-white/10 hover:bg-white/20 transition-colors z-10 cursor-pointer"
+          aria-label="Close"
+        >
+          <XIcon className="h-5 w-5 text-white" />
+        </button>
+
+        {/* Previous arrow */}
+        {hasMultiple && currentIndex > 0 && (
+          <button
+            onClick={goPrev}
+            className="absolute left-4 top-1/2 -translate-y-1/2 p-2 rounded-full bg-white/10 hover:bg-white/20 transition-colors z-10 cursor-pointer"
+            aria-label="Previous screenshot"
+          >
+            <ChevronLeftIcon className="h-6 w-6 text-white" />
+          </button>
+        )}
+
+        {/* Next arrow */}
+        {hasMultiple && currentIndex < screenshots.length - 1 && (
+          <button
+            onClick={goNext}
+            className="absolute right-4 top-1/2 -translate-y-1/2 p-2 rounded-full bg-white/10 hover:bg-white/20 transition-colors z-10 cursor-pointer"
+            aria-label="Next screenshot"
+          >
+            <ChevronRightIcon className="h-6 w-6 text-white" />
+          </button>
+        )}
+
+        {/* Image container — scrollable for panning when zoomed */}
+        <div
+          className="flex items-center justify-center w-full h-full overflow-auto"
+          style={{ touchAction: zoomed ? "pan-x pan-y" : "pinch-zoom" }}
+        >
+          {/* eslint-disable-next-line @next/next/no-img-element */}
+          <img
+            src={current.url}
+            alt={`Screenshot ${currentIndex + 1}`}
+            className={`transition-transform duration-200 ${
+              zoomed
+                ? "max-w-none cursor-zoom-out"
+                : "max-w-[90vw] max-h-[90vh] object-contain cursor-zoom-in"
+            }`}
+            style={zoomed ? { width: current.width, height: current.height } : undefined}
+            onClick={toggleZoom}
+            draggable={false}
+          />
+        </div>
+
+        {/* Counter */}
+        {hasMultiple && (
+          <div className="absolute bottom-4 left-1/2 -translate-x-1/2 px-3 py-1 rounded-full bg-white/10 text-white text-xs font-medium">
+            {currentIndex + 1} / {screenshots.length}
+          </div>
+        )}
+      </motion.div>
+    </AnimatePresence>
+  )
+}