fix: sidebar dock tabs get functional close buttons when tabified

When Project and Modules docks are tabified together, Qt creates a
tab bar with close buttons via setupDockTabBars(). The dock lookup
only searched m_docDocks, so sidebar dock close buttons were installed
but never connected — clicking × did nothing.

Now the lookup also checks m_workspaceDock, m_scannerDock, and
m_symbolsDock. Middle-click close and right-click context menu also
work for sidebar tabs. Sidebar tabs get a minimal context menu
(Close + Float/Dock) while doc tabs keep the full menu.

src/main.cpp

@@ -2112,6 +2112,15 @@ void MainWindow::setupDockTabBars() {
                 tabBar->setTabVisible(i, false);
         }
 
+        // Helper: find any dock widget by title (doc tabs + sidebar docks)
+        auto findDockByTitle = [this](const QString& title) -> QDockWidget* {
+            for (auto* d : m_docDocks)
+                if (d->windowTitle() == title) return d;
+            for (auto* d : {m_workspaceDock, m_scannerDock, m_symbolsDock})
+                if (d && d->windowTitle() == title) return d;
+            return nullptr;
+        };
+
         // Install tab buttons for any tab that doesn't have them yet
         for (int i = 0; i < tabBar->count(); ++i) {
             if (tabBar->tabText(i) == sentinelTitle)
@@ -2123,12 +2132,8 @@ void MainWindow::setupDockTabBars() {
             auto* btns = new DockTabButtons(tabBar);
             btns->applyTheme(theme.hover);
 
-            // Find dock by matching tab title
+            // Find dock by matching tab title (doc tabs + sidebar docks)
-            QString title = tabBar->tabText(i);
+            QDockWidget* target = findDockByTitle(tabBar->tabText(i));
-            QDockWidget* target = nullptr;
-            for (auto* d : m_docDocks) {
-                if (d->windowTitle() == title) { target = d; break; }
-            }
             if (target) {
                 connect(btns->closeBtn, &QToolButton::clicked,
                         target, &QDockWidget::close);
@@ -2145,22 +2150,29 @@ void MainWindow::setupDockTabBars() {
             int idx = tabBar->tabAt(pos);
             if (idx < 0) return;
 
-            // Find target dock
+            // Find target dock (doc tabs + sidebar docks)
             QString tabTitle = tabBar->tabText(idx);
             QDockWidget* target = nullptr;
             for (auto* d : m_docDocks)
                 if (d->windowTitle() == tabTitle) { target = d; break; }
+            if (!target) {
+                for (auto* d : {m_workspaceDock, m_scannerDock, m_symbolsDock})
+                    if (d && d->windowTitle() == tabTitle) { target = d; break; }
+            }
             if (!target) return;
 
-            auto tabIt = m_tabs.find(target);
+            bool isDocDock = m_docDocks.contains(target);
 
             QMenu menu;
 
             // Close
             menu.addAction(makeIcon(":/vsicons/close.svg"), "Close",
-                           QKeySequence(Qt::CTRL | Qt::Key_W),
                            [target]() { target->close(); });
 
+            // Doc-only actions
+            if (isDocDock) {
+                auto tabIt = m_tabs.find(target);
+
                 menu.addSeparator();
 
                 // Close All Tabs
@@ -2189,17 +2201,19 @@ void MainWindow::setupDockTabBars() {
                             QUrl::fromLocalFile(QFileInfo(path).absolutePath()));
                     });
                 }
+            }
+
+            menu.addSeparator();
 
             // Float / Dock
             menu.addAction(target->isFloating() ? "Dock" : "Float", [target]() {
                 target->setFloating(!target->isFloating());
             });
 
+            // New Document Groups (doc tabs only, >1 visible tab)
+            if (isDocDock) {
                 menu.addSeparator();
 
-            menu.addSeparator();
-
-            // New Document Groups (only if >1 visible tab — excludes sentinels)
                 int visibleTabs = 0;
                 for (int i = 0; i < tabBar->count(); ++i)
                     if (tabBar->isTabVisible(i)) ++visibleTabs;
@@ -2255,6 +2269,7 @@ void MainWindow::setupDockTabBars() {
                         });
                     });
                 }
+            }
 
             menu.exec(tabBar->mapToGlobal(pos));
         });
@@ -2270,7 +2285,10 @@ bool MainWindow::eventFilter(QObject* obj, QEvent* event) {
                 if (idx >= 0) {
                     QString title = tabBar->tabText(idx);
                     for (auto* d : m_docDocks) {
-                        if (d->windowTitle() == title) { d->close(); break; }
+                        if (d->windowTitle() == title) { d->close(); return true; }
+                    }
+                    for (auto* d : {m_workspaceDock, m_scannerDock, m_symbolsDock}) {
+                        if (d && d->windowTitle() == title) { d->close(); return true; }
                     }
                     return true;
                 }