Add Copy Link to the macOS video context menu (#972)

SwiftUI's ShareLink menu on macOS offers no Copy Link item, so there was
no way to copy a video URL from a context menu. Add a macOS-only Copy
Link action next to Share.

Yattee/Localizable.xcstrings

@@ -20190,6 +20190,16 @@
         }
       }
     },
+    "video.context.copyLink" : {
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Copy Link"
+          }
+        }
+      }
+    },
     "video.context.download" : {
       "localizations" : {
         "en" : {

Yattee/Views/Components/VideoContextMenu.swift

@@ -267,6 +267,17 @@ struct VideoContextMenuContent: View {
             Label(String(localized: "video.context.share"), systemImage: "square.and.arrow.up")
         }
         #endif
+
+        // The macOS ShareLink menu has no Copy Link item (#972)
+        #if os(macOS)
+        Button {
+            let pasteboard = NSPasteboard.general
+            pasteboard.clearContents()
+            pasteboard.setString((appEnvironment?.shareURL(for: video) ?? video.shareURL).absoluteString, forType: .string)
+        } label: {
+            Label(String(localized: "video.context.copyLink"), systemImage: "link")
+        }
+        #endif
     }
 
     var body: some View {