[desktop] refactor profile management and fix some misc bugs with it (#3415)

Adding and editing users is now done in a single dialog rather than all those other individual buttons and dialogs like before.

Fixed some bugs with profile management too, and made edit/delete a right-click menu.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3415

src/yuzu/configuration/system/new_user_dialog.h

@@ -0,0 +1,71 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QDialog>
+#include "common/uuid.h"
+#include "core/file_sys/vfs/vfs_types.h"
+
+class QGraphicsScene;
+class ProfileAvatarDialog;
+
+namespace Ui {
+class NewUserDialog;
+}
+
+struct User {
+    QString username;
+    Common::UUID uuid;
+    QPixmap pixmap;
+};
+
+class NewUserDialog : public QDialog
+{
+    Q_OBJECT
+    Q_PROPERTY(bool isDefaultAvatar READ isDefaultAvatar WRITE setIsDefaultAvatar NOTIFY
+                   isDefaultAvatarChanged FINAL)
+
+public:
+    explicit NewUserDialog(QWidget *parent = nullptr);
+    explicit NewUserDialog(Common::UUID uuid, const std::string &username, const QString &title, QWidget *parent = nullptr);
+    ~NewUserDialog();
+
+    bool isDefaultAvatar() const;
+    void setIsDefaultAvatar(bool newIsDefaultAvatar);
+
+    static QString GetImagePath(const Common::UUID& uuid);
+    static QPixmap GetIcon(const Common::UUID& uuid);
+    static QPixmap DefaultAvatar();
+
+private:
+    Ui::NewUserDialog *ui;
+    QGraphicsScene *m_scene;
+    QPixmap m_pixmap;
+
+    ProfileAvatarDialog* avatar_dialog;
+
+    bool m_isDefaultAvatar = true;
+    bool m_editing = false;
+
+    void setup(Common::UUID uuid, const std::string &username, const QString &title);
+    bool LoadAvatarData();
+    std::vector<uint8_t> DecompressYaz0(const FileSys::VirtualFile& file);
+
+public slots:
+    void setImage(const QPixmap &pixmap);
+    void selectImage();
+    void setAvatar();
+
+    void revertImage();
+    void updateRevertButton();
+
+    void generateUUID();
+    void verifyUser();
+
+    void dispatchUser();
+
+signals:
+    void isDefaultAvatarChanged(bool isDefaultAvatar);
+    void userAdded(User user);
+};