fix(gui): UI appearance polish — Wayland scaling, menu icon size pref, dialog cleanup

- Fix hazy text on Wayland by setting QT_SCALE_FACTOR_ROUNDING_POLICY=RoundPreferFloor
  and QT_ENABLE_HIGHDPI_SCALING=1 in deb and AppImage launchers; remove forced
  QT_QPA_PLATFORM=xcb from AppImage to allow native Wayland (fixes #33)

- Add menu icon size preference selector (Small/Medium/Large/Extra large) in
  General preferences, applied via QMenu stylesheet at startup and on save (fixes #46)

- Replace verbose theme customization banner with concise 'Kindred Create Theme'
  label in UI preferences; split Overlay group into 'Panel Visibility' and
  'Overlay Interaction' sections (fixes #35)

- Remove Addon Manager branding label from General preferences, change recent
  file list default from 4 to 10 (fixes #36)

src/Gui/PreferencePages/DlgSettingsGeneral.cpp

@@ -28,6 +28,7 @@
 #include <QApplication>
 #include <QFileDialog>
 #include <QLocale>
+#include <QMenu>
 #include <QMessageBox>
 #include <QString>
 #include <algorithm>
@@ -96,7 +97,6 @@ DlgSettingsGeneral::DlgSettingsGeneral(QWidget* parent)
                 ui->SaveNewPreferencePack->setEnabled(false);
                 ui->ManagePreferencePacks->setEnabled(false);
                 ui->themesCombobox->setEnabled(false);
-                ui->moreThemesLabel->setEnabled(false);
             }
         }
     }
@@ -121,7 +121,6 @@ DlgSettingsGeneral::DlgSettingsGeneral(QWidget* parent)
             this,
             &DlgSettingsGeneral::onThemeChanged
         );
-        connect(ui->moreThemesLabel, &QLabel::linkActivated, this, &DlgSettingsGeneral::onLinkActivated);
     }
 
     // If there are any saved config file backs, show the revert button, otherwise hide it:
@@ -147,9 +146,6 @@ DlgSettingsGeneral::DlgSettingsGeneral(QWidget* parent)
     const auto visible = UnitsApi::isMultiUnitLength();
     ui->comboBox_FracInch->setVisible(visible);
     ui->fractionalInchLabel->setVisible(visible);
-    ui->moreThemesLabel->setEnabled(
-        Application::Instance->commandManager().getCommandByName("Std_AddonMgr") != nullptr
-    );
 }
 
 /**
@@ -166,7 +162,7 @@ void DlgSettingsGeneral::setRecentFileSize()
     auto recent = getMainWindow()->findChild<RecentFilesAction*>(QLatin1String("recentFiles"));
     if (recent) {
         ParameterGrp::handle hGrp = WindowParameter::getDefaultParameter()->GetGroup("RecentFiles");
-        recent->resizeList(hGrp->GetInt("RecentFiles", 4));
+        recent->resizeList(hGrp->GetInt("RecentFiles", 10));
     }
 }
 
@@ -264,6 +260,11 @@ void DlgSettingsGeneral::saveSettings()
     hGrp->SetInt("ToolbarIconSize", pixel);
     getMainWindow()->setIconSize(QSize(pixel, pixel));
 
+    QVariant menuSize = ui->menuIconSize->itemData(ui->menuIconSize->currentIndex());
+    int menuPixel = menuSize.toInt();
+    hGrp->SetInt("MenuIconSize", menuPixel);
+    applyMenuIconSize(menuPixel);
+
     int blinkTime {hGrp->GetBool("EnableCursorBlinking", true) ? -1 : 0};
     qApp->setCursorFlashTime(blinkTime);
 
@@ -348,6 +349,7 @@ void DlgSettingsGeneral::loadSettings()
     }
 
     addIconSizes(getCurrentIconSize());
+    addMenuIconSizes(getCurrentMenuIconSize());
 
     // TreeMode combobox setup.
     loadDockWindowVisibility();
@@ -395,8 +397,9 @@ void DlgSettingsGeneral::resetSettingsToDefaults()
     hGrp = WindowParameter::getDefaultParameter()->GetGroup("General");
     // reset "Language" parameter
     hGrp->RemoveASCII("Language");
-    // reset "ToolbarIconSize" parameter
+    // reset "ToolbarIconSize" and "MenuIconSize" parameters
     hGrp->RemoveInt("ToolbarIconSize");
+    hGrp->RemoveInt("MenuIconSize");
 
     // finally reset all the parameters associated to Gui::Pref* widgets
     PreferencePage::resetSettingsToDefaults();
@@ -534,6 +537,63 @@ void DlgSettingsGeneral::translateIconSizes()
     }
 }
 
+int DlgSettingsGeneral::getCurrentMenuIconSize() const
+{
+    ParameterGrp::handle hGrp = WindowParameter::getDefaultParameter()->GetGroup("General");
+    return hGrp->GetInt("MenuIconSize", 24);
+}
+
+void DlgSettingsGeneral::addMenuIconSizes(int current)
+{
+    ui->menuIconSize->clear();
+
+    QList<int> sizes {16, 20, 24, 28};
+    if (!sizes.contains(current)) {
+        sizes.append(current);
+    }
+
+    for (int size : sizes) {
+        ui->menuIconSize->addItem(QString(), QVariant(size));
+    }
+
+    int index = ui->menuIconSize->findData(QVariant(current));
+    ui->menuIconSize->setCurrentIndex(index);
+    translateMenuIconSizes();
+}
+
+void DlgSettingsGeneral::translateMenuIconSizes()
+{
+    auto getSize = [this](int index) {
+        return ui->menuIconSize->itemData(index).toInt();
+    };
+
+    QStringList sizes;
+    sizes << tr("Small (%1px)").arg(getSize(0));
+    sizes << tr("Medium (%1px)").arg(getSize(1));
+    sizes << tr("Large (%1px)").arg(getSize(2));
+    sizes << tr("Extra large (%1px)").arg(getSize(3));
+    if (ui->menuIconSize->count() > 4) {
+        sizes << tr("Custom (%1px)").arg(getSize(4));
+    }
+
+    for (int index = 0; index < sizes.size(); index++) {
+        ui->menuIconSize->setItemText(index, sizes[index]);
+    }
+}
+
+void DlgSettingsGeneral::applyMenuIconSize(int pixel)
+{
+    // Apply menu icon size via stylesheet override on all QMenu widgets
+    QString rule = QStringLiteral("QMenu::icon { width: %1px; height: %1px; }").arg(pixel);
+    for (auto* widget : qApp->allWidgets()) {
+        if (auto* menu = qobject_cast<QMenu*>(widget)) {
+            menu->setStyleSheet(rule);
+        }
+    }
+    // Store the rule so new menus pick it up via the main window
+    getMainWindow()->setProperty("_menuIconSizeRule", rule);
+}
+
 void DlgSettingsGeneral::retranslateUnits()
 {
     auto setItem = [&, index {0}](const std::string& item) mutable {
@@ -547,6 +607,7 @@ void DlgSettingsGeneral::changeEvent(QEvent* event)
 {
     if (event->type() == QEvent::LanguageChange) {
         translateIconSizes();
+        translateMenuIconSizes();
         retranslateUnits();
         int index = ui->UseLocaleFormatting->currentIndex();
         ui->retranslateUi(this);
@@ -823,24 +884,6 @@ void DlgSettingsGeneral::onThemeChanged(int index)
     themeChanged = true;
 }
 
-void DlgSettingsGeneral::onLinkActivated(const QString& link)
-{
-    auto const addonManagerLink = QStringLiteral("freecad:Std_AddonMgr");
-
-    if (link != addonManagerLink) {
-        return;
-    }
-
-    // Set the user preferences to include only preference packs.
-    // This is a quick and dirty way to open Addon Manager with only themes.
-    auto pref = App::GetApplication().GetParameterGroupByPath(
-        "User parameter:BaseApp/Preferences/Addons"
-    );
-    pref->SetInt("PackageTypeSelection", 3);  // 3 stands for Preference Packs
-    pref->SetInt("StatusSelection", 0);       // 0 stands for any installation status
-
-    Gui::Application::Instance->commandManager().runCommandByName("Std_AddonMgr");
-}
 
 ///////////////////////////////////////////////////////////
 namespace