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>

kdegraphics-thumbnailers/kdegraphics-thumbnailers.spec

@@ -0,0 +1,55 @@
+%global debug_package %{nil}
+
+# https://fedoraproject.org/wiki/Changes/EncourageI686LeafRemoval
+ExcludeArch: %{ix86}
+
+Name:    kdegraphics-thumbnailers
+Summary: Thumbnailers for various graphic types
+Version: 26.04.3
+Release: 1%{?dist}
+
+# most sources GPLv2+, dscparse.* GPL, gscreator.* LGPLv2+,
+License: GPL-2.0-or-later
+URL:     https://www.kde.org/applications/graphics/
+
+Source0: https://download.kde.org/%{stable_kf6}/release-service/%{version}/src/%{name}-%{version}.tar.xz
+
+BuildRequires: sonic-frameworks-cmake-modules
+BuildRequires: sonic-rpm-macros
+BuildRequires: cmake(KF6Archive)
+BuildRequires: cmake(KExiv2Qt6)
+BuildRequires: cmake(KF6KIO)
+BuildRequires: cmake(QMobipocket6)
+BuildRequires: cmake(Qt6Gui)
+BuildRequires: cmake(KDcrawQt6)
+
+%description
+%{summary}.
+
+
+%prep
+%autosetup
+
+
+%build
+%cmake_kf6 \
+	-DQT_MAJOR_VERSION=6
+%cmake_build
+
+
+%install
+%cmake_install
+
+
+%files
+%license COPYING*
+%{_kf6_metainfodir}/org.kde.kdegraphics-thumbnailers.metainfo.xml
+%{_kf6_qtplugindir}/kf6/thumbcreator/blenderthumbnail.so
+%{_kf6_qtplugindir}/kf6/thumbcreator/gsthumbnail.so
+%{_kf6_qtplugindir}/kf6/thumbcreator/mobithumbnail.so
+%{_kf6_qtplugindir}/kf6/thumbcreator/rawthumbnail.so
+
+
+%changelog
+* Fri Aug 28 2026 Anders da Silva Rytter Hansen <andersrh@users.noreply.github.com> - 26.04.3-1
+- SonicDE build for Enterprise Linux 10