v0.1.2: Preferences page, About page, full icon set, redesigned edit form

- Rework the add/edit form onto a generic, catalog-driven field model
  (JobFieldCatalog + JobEditModel), replacing the old hand-written
  ApplicationEditDialog with ApplicationEditPage
- 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 edit form 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, remove debug screenshot
  scaffolding

io.github.toservetheking.Kareer.yml

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2026 ToServeTheKing <[email protected]>
+#
 # SPDX-License-Identifier: GPL-3.0-or-later
 id: io.github.toservetheking.Kareer
 runtime: org.kde.Platform
@@ -27,12 +29,12 @@ modules:
       - -DCMAKE_BUILD_TYPE=Release
     run-tests: true
     sources:
-      # For Flathub / release builds, pin to a tag AND commit:
-      - type: git
-        url: https://github.com/toservetheking/Kareer.git
-        tag: v0.1.1
-        # commit: <fill in the exact commit SHA the tag points at>
+      # For local testing before the repo is pushed:
+      - type: dir
+        path: .
       #
-      # For local testing before the repo is pushed, replace the source above with:
-      #   - type: dir
-      #     path: .
+      # For Flathub / release builds, pin to a tag AND commit instead:
+      #   - type: git
+      #     url: https://github.com/toservetheking/Kareer.git
+      #     tag: v0.1.1
+      #     commit: <fill in the exact commit SHA the tag points at>