Add missing packages for SonicDE: KDE Gear 26.04.3, KF6 6.29.0, and support packages.

Also adds manually built Plasma 6.7.4 packages (plasma-systemsettings,
plasma-keyboard/kcm, plasma-print-manager, flatpak-kcm, sddm, sddm-kcm,
kdebugsettings) and provides plasma-desktop-doc from sonic-desktop-interface-doc.

Build-order regenerated.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

sddm-kcm/sddm-kcm.spec

@@ -0,0 +1,75 @@
+# https://fedoraproject.org/wiki/Changes/EncourageI686LeafRemoval
+ExcludeArch: %{ix86}
+
+Name:    sddm-kcm
+Version: 6.7.4
+Release: 2%{?dist}
+Summary: SDDM KDE configuration module
+
+License: GPL-2.0-or-later AND GPL-3.0-only AND CC0-1.0 AND (GPL-2.0-only OR GPL-3.0-only)
+URL:     https://invent.kde.org/plasma/%{name}
+
+Source0: https://download.kde.org/%{stable_kf6}/plasma/%{version}/%{name}-%{version}.tar.xz
+Source1: https://download.kde.org/%{stable_kf6}/plasma/%{version}/%{name}-%{version}.tar.xz.sig
+
+BuildRequires:  sonic-frameworks-cmake-modules
+BuildRequires:  sonic-rpm-macros
+
+BuildRequires:  qt6-qtbase-devel
+BuildRequires:  qt6-qtdeclarative-devel
+BuildRequires:  qt6-qttools-devel
+
+BuildRequires:  cmake(KF6Archive)
+BuildRequires:  cmake(KF6Auth)
+BuildRequires:  cmake(KF6KCMUtils)
+BuildRequires:  cmake(KF6ConfigWidgets)
+BuildRequires:  cmake(KF6CoreAddons)
+BuildRequires:  cmake(KF6Declarative)
+BuildRequires:  cmake(KF6I18n)
+BuildRequires:  cmake(KF6KIO)
+BuildRequires:  cmake(KF6NewStuff)
+BuildRequires:  cmake(KF6XmlGui)
+
+BuildRequires:  libX11-devel
+BuildRequires:  libXcursor-devel
+BuildRequires:  libxcb-devel
+BuildRequires:  xcb-util-image-devel
+
+Requires:       sddm
+
+
+%description
+This is a System Settings configuration module for configuring the
+SDDM Display Manager
+
+%prep
+%autosetup
+
+
+%build
+%cmake_kf6
+%cmake_build
+
+
+%install
+%cmake_install
+%find_lang kcmsddm6_qt --with-qt --all-name
+
+
+%files -f kcmsddm6_qt.lang
+%license LICENSES/*
+%{_kf6_bindir}/sddmthemeinstaller
+%{_kf6_datadir}/applications/kcm_sddm.desktop
+%{_kf6_libexecdir}/kauth/kcmsddm_authhelper
+%{_datadir}/dbus-1/system.d/org.kde.kcontrol.kcmsddm.conf
+%{_datadir}/knsrcfiles/sddmtheme.knsrc
+%{_datadir}/dbus-1/system-services/org.kde.kcontrol.kcmsddm.service
+%{_datadir}/polkit-1/actions/org.kde.kcontrol.kcmsddm.policy
+%{_qt6_plugindir}/plasma/kcms/systemsettings/kcm_sddm.so
+
+%changelog
+* Fri Aug 28 2026 Anders da Silva Rytter Hansen <andersrh@users.noreply.github.com> - 6.7.4-2
+- SonicDE build for Enterprise Linux 10
+
+* Fri Apr 10 2026 Steve Cossette <farchord@gmail.com> - 6.6.4-1
+- 6.6.4