[Client] Settings: extract SettingsView from DlgSettings (#7482)

* [Client] Settings: extract SettingsView from DlgSettings

Move the search bar, tab bar, stacked pages and search results out of
DlgSettings into a reusable SettingsView widget. The dialog becomes a
thin frame (title, OK button, close validation) delegating to the view.
No visual or behavior change; tr() contexts preserved as DlgSettings.

* [Client] Settings: match CI clang-format-18 line breaking

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/interface/widgets/dialogs/settings_view.h

@@ -0,0 +1,98 @@
+/**
+ * @file settings_view.h
+ * @brief Settings content widget hosted by the settings dialog (and, later, the settings tab)
+ * @ingroup Dialogs
+ */
+#ifndef SETTINGS_VIEW_H
+#define SETTINGS_VIEW_H
+
+#include <QList>
+#include <QString>
+#include <QStringList>
+#include <QWidget>
+#include <qtmetamacros.h>
+
+class QModelIndex;
+class QObject;
+class QEvent;
+
+class QStackedWidget;
+class QToolButton;
+class QListView;
+class QLineEdit;
+class AbstractSettingsPage;
+class SettingsSearchModel;
+class SettingsSearchDelegate;
+
+/**
+ * @brief Settings pages with tabbed navigation and search, without any dialog chrome
+ *
+ * Owns the search bar, the tab bar, the stacked settings pages and the search
+ * results view. Dialog/tab hosts only add their own frame (buttons, titles).
+ */
+class SettingsView : public QWidget
+{
+    Q_OBJECT
+public:
+    /**
+     * @brief Page order in the tab bar, matching the order pages are added in setupUi()
+     *
+     * Use these values instead of raw indices so reordering pages never silently
+     * breaks external callers like tab_room.cpp.
+     */
+    enum SettingsPage
+    {
+        GeneralPage = 0,
+        AppearancePage,
+        UserInterfacePage,
+        DeckEditorPage,
+        StoragePage,
+        MessagesPage,
+        SoundPage,
+        ShortcutsPage,
+        NumPages
+    };
+
+    explicit SettingsView(QWidget *parent = nullptr);
+    void setTab(int index);
+    AbstractSettingsPage *page(SettingsPage which) const;
+
+private slots:
+    void onTabClicked(int index);
+    void onSearchTextChanged(const QString &text);
+    void onSearchResultClicked(const QModelIndex &index);
+
+private:
+    // UI elements
+    QLineEdit *searchEdit;           ///< Search bar for filtering settings
+    QWidget *tabBarWidget;           ///< Container widget for the tab buttons
+    QList<QToolButton *> tabButtons; ///< Navigation tab buttons
+    QStackedWidget *pagesWidget;     ///< Stacked widget containing settings pages
+    QListView *searchResultsView;    ///< Search results list view
+    QWidget *pagesContainer;         ///< Container stacking pages and search results
+
+    // Data
+    QList<AbstractSettingsPage *> pages;    ///< All settings page instances
+    SettingsSearchModel *searchModel;       ///< Model for search results
+    SettingsSearchDelegate *searchDelegate; ///< Delegate for search result rendering
+    int currentTabIndex;                    ///< Currently active tab index
+    bool searchActive;                      ///< Whether search mode is active
+
+    void setupUi();
+    void setupTabBar();
+    void buildSearchIndex();
+    void switchToTabMode();
+    void switchToSearchMode();
+    void navigateToSearchResult(const QModelIndex &index);
+    void setActiveTab(int index);
+    static void flashWidget(QWidget *widget);
+    static QStringList translatedPageNames();
+
+    void retranslateUi();
+    void retranslateTabNames();
+
+protected:
+    bool eventFilter(QObject *watched, QEvent *event) override;
+};
+
+#endif // SETTINGS_VIEW_H