Add screenshots to game detail modal

- New /api/game-screenshots route handles GET (list), POST (upload), and DELETE (remove single file)
- Screenshots stored in a screenshots/ subfolder inside each game directory
- Images converted to JPEG via Sharp on upload, named shot-{timestamp}.jpg
- Modal shows a horizontal scrollable strip of 16:9 thumbnail tiles
- Hover a tile to reveal a delete button; uploading placeholders appear per in-flight upload
- Dashed + tile triggers multi-file picker for batch uploads
- Click any thumbnail to open a full-screen lightbox with prev/next arrows, counter, and keyboard nav (←/→/Esc)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/games/GameDetailModal.tsx

@@ -27,6 +27,7 @@ interface Props {
 export default function GameDetailModal({ game, libraryId, onClose, onTagsChanged, onCoverUploaded, onDeleted }: Props) {
   const overlayRef = useRef<HTMLDivElement>(null)
   const menuRef = useRef<HTMLDivElement>(null)
+  const screenshotInputRef = useRef<HTMLInputElement>(null)
   const [menuOpen, setMenuOpen] = useState(false)
   const [editingImages, setEditingImages] = useState(false)
   const [confirming, setConfirming] = useState(false)
@@ -36,8 +37,65 @@ export default function GameDetailModal({ game, libraryId, onClose, onTagsChange
   const [renameError, setRenameError] = useState<string | null>(null)
   const [renameSaving, setRenameSaving] = useState(false)
 
+  // Screenshots state
+  const [screenshots, setScreenshots] = useState<Array<{ filename: string; url: string; thumbnailUrl: string }>>([])
+  const [screenshotsLoading, setScreenshotsLoading] = useState(false)
+  const [lightboxIndex, setLightboxIndex] = useState<number | null>(null)
+  const [deletingScreenshot, setDeletingScreenshot] = useState<string | null>(null)
+  const [uploadingCount, setUploadingCount] = useState(0)
+
+  const fetchScreenshots = useCallback(() => {
+    setScreenshotsLoading(true)
+    fetch(`/api/game-screenshots?libraryId=${encodeURIComponent(libraryId)}&gameId=${encodeURIComponent(game.id)}`)
+      .then((r) => r.json())
+      .then((data) => setScreenshots(data.screenshots ?? []))
+      .catch(() => {})
+      .finally(() => setScreenshotsLoading(false))
+  }, [libraryId, game.id])
+
+  useEffect(() => { fetchScreenshots() }, [fetchScreenshots])
+
+  const handleScreenshotUpload = async (e: React.ChangeEvent<HTMLInputElement>) => {
+    const files = Array.from(e.target.files ?? [])
+    if (files.length === 0) return
+    e.target.value = ''
+    for (const file of files) {
+      setUploadingCount((n) => n + 1)
+      const form = new FormData()
+      form.append('screenshot', file)
+      try {
+        await fetch(
+          `/api/game-screenshots?libraryId=${encodeURIComponent(libraryId)}&gameId=${encodeURIComponent(game.id)}`,
+          { method: 'POST', body: form }
+        )
+      } catch { /* ignore */ }
+      finally { setUploadingCount((n) => n - 1) }
+    }
+    fetchScreenshots()
+  }
+
+  const handleDeleteScreenshot = async (filename: string) => {
+    setDeletingScreenshot(filename)
+    try {
+      await fetch(
+        `/api/game-screenshots?libraryId=${encodeURIComponent(libraryId)}&gameId=${encodeURIComponent(game.id)}&filename=${encodeURIComponent(filename)}`,
+        { method: 'DELETE' }
+      )
+    } catch { /* ignore */ }
+    finally {
+      setDeletingScreenshot(null)
+      fetchScreenshots()
+    }
+  }
+
   useEffect(() => {
     const handleKey = (e: KeyboardEvent) => {
+      if (lightboxIndex !== null) {
+        if (e.key === 'Escape') { setLightboxIndex(null); return }
+        if (e.key === 'ArrowLeft') { setLightboxIndex((i) => (i! > 0 ? i! - 1 : i)); return }
+        if (e.key === 'ArrowRight') { setLightboxIndex((i) => (i! < screenshots.length - 1 ? i! + 1 : i)); return }
+        return
+      }
       if (e.key === 'Escape') {
         if (menuOpen) { setMenuOpen(false); return }
         if (confirming) { setConfirming(false); return }
@@ -52,7 +110,7 @@ export default function GameDetailModal({ game, libraryId, onClose, onTagsChange
       document.removeEventListener('keydown', handleKey)
       document.body.style.overflow = ''
     }
-  }, [onClose, menuOpen, editingImages, confirming, renaming])
+  }, [onClose, menuOpen, editingImages, confirming, renaming, lightboxIndex, screenshots.length])
 
   // Close menu on outside click
   useEffect(() => {
@@ -298,6 +356,80 @@ export default function GameDetailModal({ game, libraryId, onClose, onTagsChange
 
               <DownloadButton gameFiles={game.gameFiles} clientPlatform={clientPlatform} downloadUrl={fileDownloadUrl} />
 
+              {/* Screenshots */}
+              <div className="mt-4 pt-4" style={{ borderTop: '1px solid var(--border)' }}>
+                <p className="text-xs font-semibold uppercase tracking-wider mb-2" style={{ color: 'var(--text-secondary)' }}>
+                  Screenshots
+                </p>
+                <div className="flex gap-2 overflow-x-auto pb-1" style={{ scrollbarWidth: 'thin' }}>
+                  {screenshotsLoading && screenshots.length === 0 ? (
+                    <div className="flex-shrink-0 w-36 aspect-video rounded-lg animate-pulse" style={{ backgroundColor: 'var(--border)' }} />
+                  ) : (
+                    <>
+                      {screenshots.map((shot, idx) => (
+                        <div
+                          key={shot.filename}
+                          className="group relative flex-shrink-0 w-36 aspect-video rounded-lg overflow-hidden cursor-pointer"
+                          style={{ backgroundColor: 'var(--border)' }}
+                          onClick={() => setLightboxIndex(idx)}
+                        >
+                          {/* eslint-disable-next-line @next/next/no-img-element */}
+                          <img src={shot.thumbnailUrl} alt={`Screenshot ${idx + 1}`} className="w-full h-full object-cover" />
+                          {deletingScreenshot !== shot.filename && (
+                            <button
+                              onClick={(e) => { e.stopPropagation(); handleDeleteScreenshot(shot.filename) }}
+                              className="absolute top-1 right-1 w-5 h-5 rounded-full flex items-center justify-center text-xs opacity-0 group-hover:opacity-100 transition-opacity"
+                              style={{ backgroundColor: 'rgba(0,0,0,0.7)', color: '#fff' }}
+                              aria-label="Delete screenshot"
+                            >
+                              ✕
+                            </button>
+                          )}
+                          {deletingScreenshot === shot.filename && (
+                            <div className="absolute inset-0 flex items-center justify-center" style={{ backgroundColor: 'rgba(0,0,0,0.5)' }}>
+                              <span className="text-xs text-white">Deleting…</span>
+                            </div>
+                          )}
+                        </div>
+                      ))}
+                      {Array.from({ length: uploadingCount }).map((_, i) => (
+                        <div
+                          key={`uploading-${i}`}
+                          className="flex-shrink-0 w-36 aspect-video rounded-lg flex items-center justify-center animate-pulse"
+                          style={{ backgroundColor: 'var(--border)' }}
+                        >
+                          <span className="text-xs" style={{ color: 'var(--text-secondary)' }}>Uploading…</span>
+                        </div>
+                      ))}
+                      <button
+                        onClick={() => screenshotInputRef.current?.click()}
+                        className="flex-shrink-0 w-36 aspect-video rounded-lg flex items-center justify-center border-2 border-dashed transition-colors"
+                        style={{ borderColor: 'var(--border)', color: 'var(--text-secondary)' }}
+                        onMouseEnter={(e) => {
+                          ;(e.currentTarget as HTMLElement).style.borderColor = 'var(--accent)'
+                          ;(e.currentTarget as HTMLElement).style.color = 'var(--accent)'
+                        }}
+                        onMouseLeave={(e) => {
+                          ;(e.currentTarget as HTMLElement).style.borderColor = 'var(--border)'
+                          ;(e.currentTarget as HTMLElement).style.color = 'var(--text-secondary)'
+                        }}
+                        aria-label="Add screenshot"
+                      >
+                        <span className="text-xl">+</span>
+                      </button>
+                    </>
+                  )}
+                </div>
+                <input
+                  ref={screenshotInputRef}
+                  type="file"
+                  multiple
+                  accept="image/*"
+                  className="hidden"
+                  onChange={handleScreenshotUpload}
+                />
+              </div>
+
               {/* Tags */}
               <div className="mt-4 pt-4" style={{ borderTop: '1px solid var(--border)' }}>
                 <p className="text-xs font-semibold uppercase tracking-wider mb-2" style={{ color: 'var(--text-secondary)' }}>
@@ -309,6 +441,75 @@ export default function GameDetailModal({ game, libraryId, onClose, onTagsChange
           </>
         )}
       </div>
+
+      {/* Lightbox */}
+      {lightboxIndex !== null && (
+        <div
+          className="fixed inset-0 flex items-center justify-center"
+          style={{ backgroundColor: 'rgba(0,0,0,0.92)', zIndex: 60 }}
+          onClick={() => setLightboxIndex(null)}
+        >
+          <div
+            className="relative flex items-center justify-center w-full h-full p-8"
+            onClick={(e) => e.stopPropagation()}
+          >
+            {/* eslint-disable-next-line @next/next/no-img-element */}
+            <img
+              src={screenshots[lightboxIndex].url}
+              alt={`Screenshot ${lightboxIndex + 1}`}
+              className="max-w-full max-h-full object-contain rounded-lg shadow-2xl"
+            />
+
+            {/* Close */}
+            <button
+              onClick={() => setLightboxIndex(null)}
+              className="absolute top-4 right-4 w-9 h-9 rounded-full flex items-center justify-center transition-colors"
+              style={{ backgroundColor: 'rgba(255,255,255,0.15)', color: '#fff' }}
+              onMouseEnter={(e) => ((e.currentTarget as HTMLElement).style.backgroundColor = 'rgba(255,255,255,0.3)')}
+              onMouseLeave={(e) => ((e.currentTarget as HTMLElement).style.backgroundColor = 'rgba(255,255,255,0.15)')}
+              aria-label="Close"
+            >
+              ✕
+            </button>
+
+            {/* Prev */}
+            {lightboxIndex > 0 && (
+              <button
+                onClick={() => setLightboxIndex((i) => i! - 1)}
+                className="absolute left-4 top-1/2 -translate-y-1/2 w-9 h-9 rounded-full flex items-center justify-center transition-colors"
+                style={{ backgroundColor: 'rgba(255,255,255,0.15)', color: '#fff' }}
+                onMouseEnter={(e) => ((e.currentTarget as HTMLElement).style.backgroundColor = 'rgba(255,255,255,0.3)')}
+                onMouseLeave={(e) => ((e.currentTarget as HTMLElement).style.backgroundColor = 'rgba(255,255,255,0.15)')}
+                aria-label="Previous screenshot"
+              >
+                ←
+              </button>
+            )}
+
+            {/* Next */}
+            {lightboxIndex < screenshots.length - 1 && (
+              <button
+                onClick={() => setLightboxIndex((i) => i! + 1)}
+                className="absolute right-4 top-1/2 -translate-y-1/2 w-9 h-9 rounded-full flex items-center justify-center transition-colors"
+                style={{ backgroundColor: 'rgba(255,255,255,0.15)', color: '#fff' }}
+                onMouseEnter={(e) => ((e.currentTarget as HTMLElement).style.backgroundColor = 'rgba(255,255,255,0.3)')}
+                onMouseLeave={(e) => ((e.currentTarget as HTMLElement).style.backgroundColor = 'rgba(255,255,255,0.15)')}
+                aria-label="Next screenshot"
+              >
+                →
+              </button>
+            )}
+
+            {/* Counter */}
+            <div
+              className="absolute bottom-4 left-1/2 -translate-x-1/2 text-xs px-3 py-1 rounded-full"
+              style={{ backgroundColor: 'rgba(0,0,0,0.5)', color: 'rgba(255,255,255,0.7)' }}
+            >
+              {lightboxIndex + 1} / {screenshots.length}
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   )
 }