[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/qt_common/abstract/frontend.cpp

@@ -1,6 +1,7 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
+#include <QLineEdit>
 #include "frontend.h"
 #include "qt_common/qt_common.h"
 
@@ -8,6 +9,9 @@
 #include <QFileDialog>
 #endif
 
+#include <QAbstractButton>
+#include <QInputDialog>
+
 namespace QtCommon::Frontend {
 
 StandardButton ShowMessage(
@@ -50,4 +54,25 @@ const QString GetExistingDirectory(const QString& caption, const QString& dir,
 #endif
 }
 
+int Choice(const QString& title, const QString& caption, const QStringList& options) {
+    QMessageBox box(rootObject);
+    box.setText(caption);
+    box.setWindowTitle(title);
+
+    for (const QString &opt : options) {
+        box.addButton(opt, QMessageBox::AcceptRole);
+    }
+
+    box.addButton(QMessageBox::Cancel);
+
+    box.exec();
+    auto button = box.clickedButton();
+    return options.indexOf(button->text());
+}
+
+const QString GetTextInput(const QString& title, const QString& caption,
+                           const QString& defaultText) {
+    return QInputDialog::getText(rootObject, title, caption, QLineEdit::Normal, defaultText);
+}
+
 } // namespace QtCommon::Frontend