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

icons/sc-apps-kareer.svg

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- SPDX-FileCopyrightText: 2026 ToServeTheKing <[email protected]> -->
+<!-- SPDX-License-Identifier: GPL-3.0-or-later -->
+<svg width="128" height="128" viewBox="0 0 128 128" xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#63d4c7"/>
+      <stop offset="1" stop-color="#1a7a70"/>
+    </linearGradient>
+  </defs>
+
+  <!-- rounded-square backdrop -->
+  <rect x="8" y="8" width="112" height="112" rx="28" ry="28" fill="url(#bg)"/>
+
+  <!-- briefcase -->
+  <g>
+    <rect x="34" y="58" width="60" height="42" rx="6" fill="#ffffff" fill-opacity="0.92"/>
+    <rect x="52" y="46" width="24" height="14" rx="4" fill="none" stroke="#ffffff" stroke-opacity="0.92" stroke-width="6"/>
+    <rect x="34" y="72" width="60" height="10" fill="#1a7a70" fill-opacity="0.35"/>
+    <rect x="60" y="68" width="8" height="10" rx="2" fill="#1a7a70" fill-opacity="0.55"/>
+  </g>
+
+  <!-- upward trend line, representing progress through the pipeline -->
+  <polyline points="30,44 46,30 58,38 74,22 90,30" fill="none" stroke="#ffffff" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <polygon points="90,30 98,28 92,36" fill="#ffffff"/>
+</svg>