feat: add GET_PRIVATE_LINK socket command for Wayland clipboard support

Sends PRIVATE_LINK:<url> back over the socket so that file manager
extensions running inside processes with a valid Wayland surface can
write to the clipboard themselves, working around the compositor serial
requirement that prevents the background daemon from doing so.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Thomas Müller <1005065+DeepDiver1975@users.noreply.github.com>

Author: DeepDiver1975

src/gui/socketapi/socketapi.cpp

@@ -493,6 +493,22 @@ void SocketApi::command_COPY_PRIVATE_LINK(const QString &localFile, SocketListen
     fetchPrivateLinkUrlHelper(localFile, &SocketApi::copyUrlToClipboard);
 }
 
+void SocketApi::command_GET_PRIVATE_LINK(const QString &localFile, SocketListener *listener)
+{
+    QSharedPointer<SocketListener> sharedListener;
+    for (const auto &l : std::as_const(_listeners)) {
+        if (l.data() == listener) {
+            sharedListener = l;
+            break;
+        }
+    }
+    fetchPrivateLinkUrlHelper(localFile, [sharedListener](const QUrl &url) {
+        if (sharedListener) {
+            sharedListener->sendMessage(QStringLiteral("PRIVATE_LINK:") + url.toString());
+        }
+    });
+}
+
 void SocketApi::command_EMAIL_PRIVATE_LINK(const QString &localFile, SocketListener *)
 {
     fetchPrivateLinkUrlHelper(localFile, &SocketApi::emailPrivateLink);

src/gui/socketapi/socketapi.h

@@ -116,6 +116,7 @@ private Q_SLOTS:
     // The context menu actions
     Q_INVOKABLE void command_SHARE(const QString &localFile, SocketListener *listener);
     Q_INVOKABLE void command_COPY_PRIVATE_LINK(const QString &localFile, SocketListener *listener);
+    Q_INVOKABLE void command_GET_PRIVATE_LINK(const QString &localFile, SocketListener *listener);
     Q_INVOKABLE void command_EMAIL_PRIVATE_LINK(const QString &localFile, SocketListener *listener);
     Q_INVOKABLE void command_OPEN_PRIVATE_LINK(const QString &localFile, SocketListener *listener);
     Q_INVOKABLE void command_OPEN_PRIVATE_LINK_VERSIONS(const QString &localFile, SocketListener *listener);