Adds about QMenu

The commit adds the following links:
- Repository
- Bugreport
- Wiki
- Contact mail
- Licence
- Last commit and tag

Co-authored-by: Copilot <copilot@github.com>

src/app/CMakeLists.txt

@@ -9,6 +9,33 @@ qt_add_executable(skui
     ../../libs/icons.qrc
 )
 
+find_package(Git QUIET)
+set(SKUI_BUILD_COMMIT "unknown")
+set(SKUI_BUILD_TAG "")
+
+if(GIT_FOUND)
+    execute_process(
+        COMMAND "${GIT_EXECUTABLE}" rev-parse --short=8 HEAD
+        WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+        OUTPUT_VARIABLE SKUI_BUILD_COMMIT
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        ERROR_QUIET
+    )
+
+    execute_process(
+        COMMAND "${GIT_EXECUTABLE}" describe --tags --abbrev=0 HEAD
+        WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+        OUTPUT_VARIABLE SKUI_BUILD_TAG
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        ERROR_QUIET
+    )
+endif()
+
+target_compile_definitions(skui PRIVATE
+    SKUI_BUILD_COMMIT="${SKUI_BUILD_COMMIT}"
+    SKUI_BUILD_TAG="${SKUI_BUILD_TAG}"
+)
+
 target_link_libraries(skui PRIVATE Qt6::Widgets)
 
 set_target_properties(skui PROPERTIES

src/app/mainwindow.cpp

@@ -24,7 +24,7 @@ MainWindow::MainWindow(QWidget *parent)
 
     loadInsertVisualMenu();
     loadDebugMenu();
-
+    loadAboutMenu();
     loadAlignTools();
 
     connect(this, &MainWindow::modeChanged, new_document->panel(), &Panel::setMode);
@@ -56,6 +56,41 @@ void MainWindow::loadDebugMenu()
 #endif
 }
 
+void MainWindow::loadAboutMenu()
+{
+    QMenu *about_menu = menuBar()->addMenu("About");
+
+    about_menu->addAction("Repository", this, [] {
+        QDesktopServices::openUrl(QUrl("https://dev.skui.eu/SKUI/SKUI"));
+    });
+
+    about_menu->addAction("Report a Bug", this, [] {
+        QDesktopServices::openUrl(QUrl("https://dev.skui.eu/SKUI/SKUI/issues/"
+                                       "new?template=.gitea%2fissue_template%2fbug-report.yml"));
+    });
+
+    about_menu->addAction("Wiki", this, [] {
+        QDesktopServices::openUrl(QUrl("https://dev.skui.eu/SKUI/SKUI/wiki"));
+    });
+
+    about_menu->addAction("Contact Mail", this, [] {
+        QDesktopServices::openUrl(QUrl("mailto:info@skui.eu"));
+    });
+
+    about_menu->addAction("License (GPLv3)", this, [] {
+        QDesktopServices::openUrl(QUrl("https://dev.skui.eu/SKUI/SKUI/src/branch/main/LICENSE"));
+    });
+
+    const QString build_commit = QString::fromLatin1(SKUI_BUILD_COMMIT);
+    const QString build_tag = QString::fromLatin1(SKUI_BUILD_TAG);
+    QString info_title = QStringLiteral("Commit (") + build_commit;
+    if (!build_tag.isEmpty()) {
+        info_title += QStringLiteral(", ") + build_tag;
+    }
+    info_title += QLatin1Char(')');
+    about_menu->addAction(info_title);
+}
+
 void MainWindow::loadAlignTools()
 {
     const AlignTool align_tools[]

src/app/mainwindow.h

@@ -1,8 +1,10 @@
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 
+#include <QDesktopServices>
 #include <QDir>
 #include <QMainWindow>
+#include <QMessageBox>
 
 #include "document.h"
 #include "nodeeditor.h"
@@ -43,6 +45,7 @@ private:
 
     void loadInsertVisualMenu();
     void loadDebugMenu();
+    void loadAboutMenu();
     void loadAlignTools();
 
     DisplayMode m_display_mode = DisplayMode::Run;