[desktop] Add mod importer from folder and zip (#3472)

Closes #3125

Adds buttons to the addons page that imports a mod (or mods) from zip or folder.

Currently known to work with mods that provide proper romfs/exefs things, unsure about cheats and such. Also works on mods that just stuff things into the root of the zip.

TODO:
- [ ] test folder more thoroughly
- [ ] cheats
- [ ] test all sorts of mod pack types

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3472
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

src/yuzu/configuration/addon/mod_select_dialog.h

@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QDialog>
+#include <QStandardItemModel>
+
+namespace Ui {
+class ModSelectDialog;
+}
+
+class ModSelectDialog : public QDialog {
+    Q_OBJECT
+
+public:
+    explicit ModSelectDialog(const QStringList &mods, QWidget* parent = nullptr);
+    ~ModSelectDialog();
+
+signals:
+    void modsSelected(const QStringList &mods);
+private:
+    Ui::ModSelectDialog* ui;
+
+    QStandardItemModel* item_model;
+};