feat(merge): 添加合并预览 Tab 页

- 新增第三个 Tab「合并预览」，只读展示系统+用户 PATH 完整列表
- 选项卡切换时自动刷新合并列表
- 支持无效/重复路径高亮
- 新增中英文翻译

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

include/controller/callbacks_internal.h

@@ -23,4 +23,7 @@ Ihandle *get_current_list(Ihandle *dlg);
 // 刷新撤销/重做按钮的启用状态
 void refresh_undo_redo_buttons(Ihandle *dlg);
 
+// 同步合并预览列表
+void sync_merged_list(Ihandle *dlg);
+
 #endif // CALLBACKS_INTERNAL_H

include/utils/ui_constants.h

@@ -10,6 +10,7 @@
 // 列表控件
 #define CTRL_LIST_SYS "LIST_SYS"
 #define CTRL_LIST_USER "LIST_USER"
+#define CTRL_LIST_MERGED "LIST_MERGED"
 
 // 选项卡
 #define CTRL_TABS_MAIN "TABS_MAIN"

lua/config.lua

@@ -51,6 +51,7 @@ local config = {
         search_placeholder = "Search...",
         tab_sys = "System Variables",
         tab_user = "User Variables",
+        tab_merged = "Merged Preview",
         export_title = "Export PATH",
         import_title = "Import PATH"
     },

po/en_US.po

@@ -28,6 +28,10 @@ msgstr "System Variables"
 msgid "User Variables"
 msgstr "User Variables"
 
+#: src/ui/main_window.c
+msgid "Merged Preview"
+msgstr "Merged Preview"
+
 #: src/ui/main_window.c
 msgid "New"
 msgstr "New"

po/messages.pot

@@ -29,6 +29,10 @@ msgstr ""
 msgid "User Variables"
 msgstr ""
 
+#: src/ui/main_window.c
+msgid "Merged Preview"
+msgstr ""
+
 #: src/ui/main_window.c
 msgid "New"
 msgstr ""

po/zh_CN.po

@@ -28,6 +28,10 @@ msgstr "系统变量"
 msgid "User Variables"
 msgstr "用户变量"
 
+#: src/ui/main_window.c
+msgid "Merged Preview"
+msgstr "合并预览"
+
 #: src/ui/main_window.c
 msgid "New"
 msgstr "新建"

src/controller/callbacks.c

@@ -3,6 +3,7 @@
 #include "core/app_context.h"
 #include "core/undo_redo.h"
 #include "utils/ui_constants.h"
+#include "ui/ui_utils.h"
 #include <iup.h>
 
 // 辅助函数：获取主对话框
@@ -62,3 +63,24 @@ void refresh_undo_redo_buttons(Ihandle *dlg)
     if (btn_redo)
         IupSetAttribute(btn_redo, "ACTIVE", can_redo(ctx->undo_redo_mgr) ? "YES" : "NO");
 }
+
+// 同步合并预览列表（sys + user）
+void sync_merged_list(Ihandle *dlg)
+{
+    AppContext *ctx = get_app_context_from_dlg(dlg);
+    Ihandle *list_merged = IupGetDialogChild(dlg, CTRL_LIST_MERGED);
+    if (!ctx || !list_merged)
+        return;
+
+    IupSetAttribute(list_merged, "REMOVEITEM", "ALL");
+
+    int pos = 1;
+    for (int i = 0; i < ctx->sys_paths.count; i++)
+        IupSetAttributeId(list_merged, "", pos++, string_list_get(&ctx->sys_paths, i));
+    for (int i = 0; i < ctx->user_paths.count; i++)
+        IupSetAttributeId(list_merged, "", pos++, string_list_get(&ctx->user_paths, i));
+
+    int total = ctx->sys_paths.count + ctx->user_paths.count;
+    IupSetInt(list_merged, "COUNT", total);
+    refresh_single_list_style(list_merged);
+}

src/controller/callbacks_sys.c

@@ -164,6 +164,7 @@ void load_all_paths(void)
 
     sync_string_list_to_ui(list_sys, &ctx->sys_paths);
     sync_string_list_to_ui(list_user, &ctx->user_paths);
+    sync_merged_list(dlg);
 
     Ihandle *lbl_status = IupGetDialogChild(dlg, CTRL_LBL_STATUS);
     if (lbl_status)

src/ui/main_window.c

@@ -1,5 +1,6 @@
 #include "ui/main_window.h"
 #include "controller/callbacks.h"
+#include "controller/callbacks_internal.h"
 #include "core/lua_config.h"
 #include "utils/i18n.h"
 #include "utils/ui_constants.h"
@@ -24,6 +25,16 @@ static Ihandle *create_path_list(const char *name)
     return list;
 }
 
+// 选项卡切换回调：切换到合并预览时刷新列表
+static int tab_change_cb(Ihandle *self, Ihandle *new_tab, Ihandle *old_tab)
+{
+    (void)old_tab;
+    (void)new_tab;
+    Ihandle *dlg = IupGetDialog(self);
+    sync_merged_list(dlg);
+    return IUP_DEFAULT;
+}
+
 // 创建主窗口
 Ihandle *create_main_window(void)
 {
@@ -31,6 +42,15 @@ Ihandle *create_main_window(void)
     Ihandle *list_sys = create_path_list(CTRL_LIST_SYS);
     // 创建用户路径列表
     Ihandle *list_user = create_path_list(CTRL_LIST_USER);
+    // 创建合并预览列表（只读）
+    Ihandle *list_merged = IupFlatList();
+    IupSetAttribute(list_merged, "NAME", CTRL_LIST_MERGED);
+    IupSetAttribute(list_merged, "EXPAND", "YES");
+    IupSetAttribute(list_merged, "ITEMPADDING", lua_config_get_string("list", "item_padding"));
+    IupSetAttribute(list_merged, "BACKCOLOR", lua_config_get_string("list", "backcolor"));
+    IupSetAttribute(list_merged, "BORDER", "YES");
+    IupSetAttribute(list_merged, "HLINE", "NO");
+    IupSetAttribute(list_merged, "ACTIVE", "NO");  // 只读
 
     // 创建搜索框
     Ihandle *txt_search = IupText(NULL);
@@ -43,11 +63,14 @@ Ihandle *create_main_window(void)
     Ihandle *tabs_main = IupTabs(
         IupVbox(list_sys, NULL),
         IupVbox(list_user, NULL),
+        IupVbox(list_merged, NULL),
         NULL);
     IupSetAttribute(tabs_main, "NAME", CTRL_TABS_MAIN);
     IupSetAttribute(tabs_main, "TABTITLE0", _(lua_config_get_string("label", "tab_sys")));
     IupSetAttribute(tabs_main, "TABTITLE1", _(lua_config_get_string("label", "tab_user")));
+    IupSetAttribute(tabs_main, "TABTITLE2", _(lua_config_get_string("label", "tab_merged")));
     IupSetAttribute(tabs_main, "TABTYPE", "TOP");
+    IupSetCallback(tabs_main, "TABCHANGE_CB", (Icallback)tab_change_cb);
 
     // 创建操作按钮
     Ihandle *btn_new = IupButton(_(lua_config_get_string("button", "new")), NULL);
@@ -201,6 +224,7 @@ void refresh_main_window_ui(Ihandle *main_dlg)
     {
         IupSetAttribute(tabs, "TABTITLE0", _(lua_config_get_string("label", "tab_sys")));
         IupSetAttribute(tabs, "TABTITLE1", _(lua_config_get_string("label", "tab_user")));
+        IupSetAttribute(tabs, "TABTITLE2", _(lua_config_get_string("label", "tab_merged")));
     }
 
     // 辅助函数：设置子控件标题