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>

flatpak-kcm/flatpak-kcm.spec

@@ -0,0 +1,54 @@
+# https://fedoraproject.org/wiki/Changes/EncourageI686LeafRemoval
+ExcludeArch: %{ix86}
+
+Name:          flatpak-kcm
+Version:       6.7.4
+Release:       2%{?dist}
+License:       BSD-2-Clause and BSD-3-Clause and CC0-1.0 and GPL-2.0-or-later
+Summary:       Flatpak Permissions Management KCM
+Url:           https://invent.kde.org/plasma/flatpak-kcm
+
+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: gcc-c++
+BuildRequires: sonic-rpm-macros
+BuildRequires: desktop-file-utils
+
+BuildRequires: cmake(KF6Declarative)
+BuildRequires: cmake(KF6I18n)
+BuildRequires: cmake(KF6ItemModels)
+BuildRequires: cmake(KF6KCMUtils)
+BuildRequires: cmake(KF6IconThemes)
+
+BuildRequires: cmake(Qt6Svg)
+
+BuildRequires: pkgconfig(flatpak)
+
+%description
+%{summary}.
+
+%prep
+%autosetup -p1
+
+%build
+%cmake_kf6
+%cmake_build
+
+%install
+%cmake_install
+desktop-file-validate %{buildroot}%{_datadir}/applications/kcm_app-permissions.desktop
+%find_lang kcm_app-permissions
+
+%files -f kcm_app-permissions.lang
+%license LICENSES/*
+%{_kf6_qtplugindir}/plasma/kcms/systemsettings/kcm_app-permissions.so
+%{_kf6_datadir}/applications/kcm_app-permissions.desktop
+
+%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