Use json file based themes instead of code to create them (theme editor + theme mode settings)

common/themes/theme_editor_dialog.h

@@ -0,0 +1,63 @@
+#ifndef THEME_EDITOR_DIALOG_H
+#define THEME_EDITOR_DIALOG_H
+
+#include <QDialog>
+#include <QJsonObject>
+
+class QComboBox;
+class QLabel;
+class QLineEdit;
+class QTreeWidget;
+class QTreeWidgetItem;
+
+// Generic theme parameter editor.
+// Works entirely on QJsonObject — has no knowledge of app-specific ThemeParams.
+// Connect to themeJsonChanged to receive live updates as the user edits colors.
+class ThemeEditorDialog : public QDialog
+{
+    Q_OBJECT
+public:
+    explicit ThemeEditorDialog(const QJsonObject &params, QWidget *parent = nullptr);
+
+    QJsonObject currentParams() const { return params; }
+
+signals:
+    void themeJsonChanged(const QJsonObject &params);
+
+private:
+    void populate(QTreeWidgetItem *parent, const QJsonObject &obj, const QStringList &path);
+    void editColorItem(QTreeWidgetItem *item);
+    void applyColorToItem(QTreeWidgetItem *item, const QColor &color);
+    void toggleBoolItem(QTreeWidgetItem *item);
+    void editNumberItem(QTreeWidgetItem *item);
+    void filterTree(const QString &query);
+    void saveToFile();
+    void loadFromFile();
+
+    // Identify feature: hold the (i) button to temporarily flash the UI element
+    // that uses the current item's value. The original value is restored on release.
+    void identifyPressed();
+    void identifyReleased();
+
+    static QIcon colorIcon(const QColor &color);
+    static void setJsonPath(QJsonObject &root, const QStringList &path, const QJsonValue &value);
+
+    QTreeWidget *tree;
+    QLineEdit *searchEdit;
+    QJsonObject params;
+
+    // Meta UI
+    QLabel *idLabel;
+    QLineEdit *nameEdit;
+    QComboBox *variantCombo;
+
+    void syncMetaToParams();
+    void syncMetaFromParams();
+
+    // Identify state (null item = inactive)
+    QTreeWidgetItem *identifyItem = nullptr;
+    QStringList identifyPath;
+    QJsonValue identifySnapshot; // original value saved on press, restored on release
+};
+
+#endif // THEME_EDITOR_DIALOG_H