Connect to project plugin projectChanged signal

Listen for Kate project switches via kateprojectplugin projectChanged()
signal. When fired, re-detect workspace and refresh all state. This
ensures the repo combo hides when switching to a non-workspace project.

gitplusplus.cpp

@@ -545,6 +545,12 @@ GitPlusPlusView::GitPlusPlusView(GitPlusPlusPlugin *plugin, KTextEditor::MainWin
         }
     });
 
+    // Connect to project plugin for project-switch detection
+    QObject *projectPluginView = m_mainWindow->pluginView(QStringLiteral("kateprojectplugin"));
+    if (projectPluginView) {
+        connect(projectPluginView, SIGNAL(projectChanged()), this, SLOT(onProjectChanged()));
+    }
+
     // Refresh everything when the active view changes (project might have changed)
     connect(m_mainWindow, &KTextEditor::MainWindow::viewChanged, this, [this]() {
         QString newDir = projectBaseDir();
@@ -1045,6 +1051,17 @@ void GitPlusPlusView::runRemoteGit(const QStringList &args, const QString &opNam
 // Git operations
 // ============================================================================
 
+void GitPlusPlusView::onProjectChanged()
+{
+    QString newDir = projectBaseDir();
+    if (newDir != m_gitDir) {
+        m_gitDir = newDir;
+        detectWorkspace();
+        setupFileWatcher();
+        refreshAll();
+    }
+}
+
 void GitPlusPlusView::updateStatus()
 {
     m_gitDir = projectBaseDir();

gitplusplus.h

@@ -63,6 +63,7 @@ public:
 private Q_SLOTS:
     // Status
     void updateStatus();
+    void onProjectChanged();
     void onStatusFinished(int exitCode, QProcess::ExitStatus exitStatus);
 
     // Stage/commit