feat(ui): add show in file manager button to screenshot view

- Add Tools::open_file_manager helper with Windows and Linux support.
- Ensure screenshot directory is created before scanning.
- Add localization keys for en_US and zh_CN.

assets/lang/en_US.json

@@ -48,5 +48,6 @@
     "item.stone.name": "stone",
     "item.water.name": "water",
     "item.pig_spawn_egg.name": "pig spawn egg",
-    "screenshot.no_screenshot": "No Screenshot"
+    "screenshot.no_screenshot": "No Screenshot",
+    "button.show_in_file_manager": "Show In File Manager"
 }

assets/lang/zh_CN.json

@@ -48,5 +48,6 @@
     "item.stone.name": "石头",
     "item.water.name": "水",
     "item.pig_spawn_egg.name": "猪猪刷怪蛋",
-    "screenshot.no_screenshot": "没有截图"
+    "screenshot.no_screenshot": "没有截图",
+    "button.show_in_file_manager": "在文件管理器中显示"
 }

include/Cubed/tools/file_utils.hpp

@@ -0,0 +1,57 @@
+#pragma once
+#include "Cubed/tools/log.hpp"
+
+#include <filesystem>
+#include <string>
+
+#ifdef _WIN32
+// clang-format off
+#include <windows.h>
+#include <shellapi.h>
+// clang-format on
+#elif __linux__
+#include <cstdlib>
+#endif
+
+namespace Cubed::Tools {
+
+inline void open_file_manager(const std::filesystem::path& path) {
+#ifdef _WIN32
+
+    ShellExecuteW(nullptr, L"open", path.wstring().c_str(), nullptr, nullptr,
+                  SW_SHOWNORMAL);
+
+#elif __linux__
+
+    constexpr const char* FILE_MANAGERS[] = {"nautilus", "dolphin", "thunar",
+                                             "nemo", "pcmanfm"};
+
+    auto is_available = [](const char* exe) {
+        std::string cmd = std::string("command -v ") + exe + " >/dev/null 2>&1";
+        return std::system(cmd.c_str()) == 0;
+    };
+
+    const std::string QUOTED = "\"" + path.string() + "\"";
+    for (const char* fm : FILE_MANAGERS) {
+        if (!is_available(fm)) {
+            continue;
+        }
+        std::string cmd = std::string(fm) + " " + QUOTED + " >/dev/null 2>&1 &";
+        if (std::system(cmd.c_str()) == 0) {
+            return;
+        }
+    }
+
+    // Fallback: let the system choose a handler.
+    if (is_available("xdg-open")) {
+        std::string cmd = "xdg-open " + QUOTED + " >/dev/null 2>&1 &";
+        if (std::system(cmd.c_str()) == 0) {
+            return;
+        }
+    }
+
+    Logger::warn("Failed to open file manager for {}", path.string());
+#endif
+}
+
+} // namespace Cubed::Tools

src/ui/screenshot_ui.cpp

@@ -4,6 +4,7 @@
 #include "Cubed/localization.hpp"
 #include "Cubed/render/renderer.hpp"
 #include "Cubed/scene/screenshot_scene.hpp"
+#include "Cubed/tools/file_utils.hpp"
 #include "Cubed/ui/button.hpp"
 #include "Cubed/ui/column_layout.hpp"
 #include "Cubed/ui/row_layout.hpp"
@@ -45,6 +46,7 @@ void ScreenshotUI::update_layout(int width, int height) {
 
     constexpr float IMAGE_SCALE = 0.25;
     ScrollView* sv = nullptr;
+    fs::create_directories(path);
     if (fs::exists(path)) {
         for (auto& entry : fs::recursive_directory_iterator(path)) {
             if (!fs::is_regular_file(entry)) {
@@ -109,20 +111,27 @@ void ScreenshotUI::update_layout(int width, int height) {
             .set_color(Color::WHITE)
             .set_anchor(Anchor::CENTER);
     }
-    auto& return_button = bg->add_child<Button>();
+    auto& bottom_row = bg->add_child<RowLayout>();
+    bottom_row.set_spacing(10);
+    bottom_row.set_anchor(Anchor::BOTTOM_CENTER).set_offset({0, -30});
+    auto& open_file = bottom_row.add_child<Button>();
+    open_file.set_default_image(texture_manager)
+        .set_text(tr("button.show_in_file_manager"))
+        .set_clicked(
+            []() { Tools::open_file_manager(Renderer::SCREENSHOT_PATH); });
+    auto& return_button = bottom_row.add_child<Button>();
     return_button.set_default_image(texture_manager);
-    return_button.set_anchor(Anchor::BOTTOM_CENTER);
-    return_button.set_offset({0, -30});
     return_button.set_text(tr("button.return"));
     return_button.set_clicked(
         [this]() { m_scene.scene_manager().request_pop(); });
     if (sv) {
         float scroll_height = height - sv->get_offset().y +
-                              return_button.get_offset().y -
+                              bottom_row.get_offset().y -
                               return_button.height();
 
         sv->set_height(std::max(0.0f, scroll_height));
     }
+
     auto& rect = bg->add_child<Rect>();
     rect.set_fill_parent(true);
     rect.set_color(Color::BLACK).set_alpha(0.5f);