v0.2.2: Preferences page, About page, full icon set, redesigned permissions list

- Add a Preferences page (reachable from the hamburger menu) with a
  KColorSchemeManager-backed color scheme switcher
- Add an About page reading from KAboutData
- Ship a full hicolor icon set (16-128px + scalable) via ecm_install_icons
  instead of a single flat SVG
- Restyle the permissions list after KDE System Settings' Audio page:
  Kirigami.ListSectionHeader per category, flat separated rows, no card
  borders
- Explicitly declare Kirigami/KirigamiAddons/ColorScheme as CMake
  dependencies instead of relying on the QML import scanner alone
- Add KDEClangFormat/KDEGitCommitHooks, a CMakePresets.json, and a
  REUSE + clang-format lint CI workflow
- Reformat SPDX headers to include copyright, and tidy up a stray
  namespace inconsistency

autotests/CMakeLists.txt

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2026 ToServeTheKing <[email protected]>
+#
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 add_executable(resolutiontest

autotests/resolutiontest.cpp

@@ -1,4 +1,9 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+/*
+    SPDX-FileCopyrightText: 2026 ToServeTheKing <[email protected]>
+
+    SPDX-License-Identifier: GPL-3.0-or-later
+*/
+
 #include "keyfile.h"
 #include "permissionscontroller.h"