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

src/jobeditmodel.h

@@ -0,0 +1,83 @@
+/*
+    SPDX-FileCopyrightText: 2026 ToServeTheKing <[email protected]>
+
+    SPDX-License-Identifier: GPL-3.0-or-later
+*/
+
+#pragma once
+
+#include "jobfieldcatalog.h"
+#include "jobsmodel.h"
+
+#include <QAbstractListModel>
+#include <QHash>
+#include <QQmlEngine>
+#include <QVariant>
+
+/**
+ * Drives the add/edit form the way FlatKontrol's PermissionsController drives
+ * PermissionsPage: a generic row model (one row per JobFieldCatalog::Field)
+ * that QML renders via Repeater + DelegateChooser on rowType, instead of
+ * each field being hand-written in QML.
+ */
+class JobEditModel : public QAbstractListModel
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY(JobsModel *jobsModel READ jobsModel WRITE setJobsModel NOTIFY jobsModelChanged)
+    Q_PROPERTY(int editingJobId READ editingJobId WRITE setEditingJobId NOTIFY editingJobIdChanged)
+    Q_PROPERTY(QVariantList categories READ categories CONSTANT)
+    Q_PROPERTY(QString lastError READ lastError NOTIFY lastErrorChanged)
+
+public:
+    enum Roles {
+        FieldIdRole = Qt::UserRole + 1,
+        CategoryIdRole,
+        LabelRole,
+        RowTypeRole,
+        ValueRole,
+        ComboOptionsRole,
+        PlaceholderRole,
+        SpinMinRole,
+        SpinMaxRole,
+    };
+    Q_ENUM(Roles)
+
+    explicit JobEditModel(QObject *parent = nullptr);
+
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    QVariant data(const QModelIndex &index, int role) const override;
+    QHash<int, QByteArray> roleNames() const override;
+
+    JobsModel *jobsModel() const;
+    void setJobsModel(JobsModel *model);
+
+    int editingJobId() const;
+    void setEditingJobId(int id);
+
+    QVariantList categories() const;
+    QString lastError() const;
+
+    /// Updates the value for the field at this row (called from the QML delegate).
+    Q_INVOKABLE void setValue(int row, const QVariant &value);
+
+    /// Persists the current values via jobsModel; true on success.
+    Q_INVOKABLE bool save();
+
+    Q_INVOKABLE bool deleteJob();
+
+Q_SIGNALS:
+    void jobsModelChanged();
+    void editingJobIdChanged();
+    void lastErrorChanged();
+
+private:
+    void resetValues();
+
+    JobsModel *m_jobsModel = nullptr;
+    int m_editingJobId = -1;
+    QHash<QString, QVariant> m_values;
+    QString m_lastError;
+    QList<JobFieldCatalog::Field> m_fields;
+};