[desktop] Data Manager, data import/export (#2700)

This adds a "Data Manager" dialog to the Tools menu. The Data Manager allows for the following operations:
- Open w/ system file manager
- Clear
- Export
- Import

On any of the following directories:
- Save (w/ profile selector)
- UserNAND
- SysNAND
- Mods
- Shaders

TODO for the future:
- "Cleanup" for each directory
- TitleID -> Game name--let users clean data for a specific game if applicable

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2700
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

src/qt_common/qt_string_lookup.h

@@ -0,0 +1,38 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QString>
+#include <frozen/string.h>
+#include <frozen/unordered_map.h>
+#include <qobjectdefs.h>
+#include <qtmetamacros.h>
+
+namespace QtCommon::StringLookup {
+
+Q_NAMESPACE
+
+// TODO(crueter): QML interface
+enum StringKey {
+    SavesTooltip,
+    ShadersTooltip,
+    UserNandTooltip,
+    SysNandTooltip,
+    ModsTooltip,
+};
+
+static constexpr const frozen::unordered_map<StringKey, frozen::string, 5> strings = {
+    {SavesTooltip, "Contains game save data. DO NOT REMOVE UNLESS YOU KNOW WHAT YOU'RE DOING!"},
+    {ShadersTooltip, "Contains Vulkan and OpenGL pipeline caches. Generally safe to remove."},
+    {UserNandTooltip, "Contains updates and DLC for games."},
+    {SysNandTooltip, "Contains firmware and applet data."},
+    {ModsTooltip, "Contains game mods, patches, and cheats."},
+};
+
+static inline const QString Lookup(StringKey key)
+{
+    return QString::fromStdString(strings.at(key).data());
+}
+
+}