Implement theme pickers + importing

common/themes/appearance_tab_widget.h

@@ -1,13 +1,19 @@
 #ifndef APPEARANCE_TAB_WIDGET_H
 #define APPEARANCE_TAB_WIDGET_H
 
+#include "theme_variant.h"
+
 #include <QJsonObject>
 #include <QPointer>
 #include <QWidget>
 #include <functional>
+#include <optional>
 
 class AppearanceConfiguration;
+class QComboBox;
+class QPushButton;
 class ThemeEditorDialog;
+class ThemeRepository;
 
 class AppearanceTabWidget : public QWidget
 {
@@ -15,15 +21,38 @@ class AppearanceTabWidget : public QWidget
 public:
     explicit AppearanceTabWidget(
             AppearanceConfiguration *config,
+            ThemeRepository *repository,
             std::function<QJsonObject()> currentThemeJson,
             std::function<void(const QJsonObject &)> applyTheme,
             QWidget *parent = nullptr);
 
 private:
     AppearanceConfiguration *config;
+    ThemeRepository *repository;
     std::function<QJsonObject()> currentThemeJson;
     std::function<void(const QJsonObject &)> applyTheme;
     QPointer<ThemeEditorDialog> themeEditor;
+
+    // One row per picker; shown/hidden based on active mode
+    QWidget *lightRow = nullptr;
+    QWidget *darkRow = nullptr;
+    QWidget *customRow = nullptr;
+
+    QComboBox *lightCombo = nullptr;
+    QComboBox *darkCombo = nullptr;
+    QComboBox *customCombo = nullptr;
+
+    QPushButton *lightDeleteBtn = nullptr;
+    QPushButton *darkDeleteBtn = nullptr;
+    QPushButton *customDeleteBtn = nullptr;
+
+    // Populate a combo with themes, filtered strictly by variant (or all if nullopt).
+    void populateCombo(QComboBox *combo, std::optional<ThemeVariant> variantFilter, const QString &selectedId);
+    void repopulateCombos();
+    void updateDeleteButton(QComboBox *combo, QPushButton *btn);
+    void updateModeRows();
+    void importTheme();
+    void deleteTheme(QComboBox *combo, QPushButton *deleteBtn);
 };
 
 #endif // APPEARANCE_TAB_WIDGET_H