feat(shortcuts): 添加全局快捷键 Ctrl+N/S/F

- Ctrl+N: 新建路径
- Ctrl+S: 保存（确定）
- Ctrl+F: 聚焦搜索框
- 对话框级 K_ANY 回调，列表级 K_ANY 保持 Ctrl+Z/Y/DEL

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

include/controller/callbacks.h

@@ -33,6 +33,7 @@ int list_dropfiles_cb(Ihandle *self, const char *filename, int num, int x, int y
 
 // 键盘按键回调
 int list_k_any_cb(Ihandle *self, int c);
+int dlg_k_any_cb(Ihandle *self, int c);
 
 // 载入数据与更新UI
 void load_all_paths(void);

src/controller/callbacks_sys.c

@@ -202,3 +202,26 @@ int btn_help_cb(Ihandle *self)
 
     return IUP_DEFAULT;
 }
+
+// 对话框全局快捷键回调
+int dlg_k_any_cb(Ihandle *self, int c)
+{
+    if (c == K_cN)  // Ctrl+N 新建
+    {
+        btn_new_cb(self);
+        return IUP_IGNORE;
+    }
+    if (c == K_cS)  // Ctrl+S 保存
+    {
+        btn_ok_cb(self);
+        return IUP_IGNORE;
+    }
+    if (c == K_cF)  // Ctrl+F 聚焦搜索框
+    {
+        Ihandle *txt_search = IupGetDialogChild(self, CTRL_TXT_SEARCH);
+        if (txt_search)
+            IupSetFocus(txt_search);
+        return IUP_IGNORE;
+    }
+    return IUP_DEFAULT;
+}

src/ui/main_window.c

@@ -181,6 +181,7 @@ Ihandle *create_main_window(void)
     IupSetAttribute(dlg, "MINSIZE", lua_config_get_string("dialog", "minsize"));
     IupSetAttribute(dlg, "MINBOX", "NO");
     IupSetAttribute(dlg, "MAXBOX", "NO");
+    IupSetCallback(dlg, "K_ANY", (Icallback)dlg_k_any_cb);
 
     return dlg;
 }