feat(gui): 新增重新打包3MF按钮，选择解压目录自动更新MD5并打包

a1_swap_mod_packer/gui.py

@@ -499,6 +499,10 @@ class MainWindow(QMainWindow):
         self.skip_duplicates_check = QCheckBox(t("gui.options.skip_duplicates"))
         self.skip_duplicates_check.setChecked(True)
 
+        # 重新打包解压的 3MF
+        self.repack_3mf_button = QPushButton(t("gui.options.repack_3mf"))
+        self.repack_3mf_button.clicked.connect(self.repack_3mf_folder)
+
         # 标签列固定宽度（左对齐），控件列自动对齐（stretch=1 平分空间）
         grid.setColumnMinimumWidth(0, 120)
         grid.setColumnMinimumWidth(2, 90)
@@ -552,6 +556,9 @@ class MainWindow(QMainWindow):
         # 第 6 行：构建成功后清空输入列表（独立一行）
         grid.addWidget(self.clear_after_build_check, 6, 1, 1, 3)
 
+        # 第 7 行：重新打包 3MF
+        grid.addWidget(self.repack_3mf_button, 7, 1, 1, 3)
+
         root.addWidget(self.options_group)
 
         # =====================================================================
@@ -809,6 +816,57 @@ class MainWindow(QMainWindow):
             return
         self.open_path(path)
 
+    def repack_3mf_folder(self) -> None:
+        """选择解压后的3MF文件夹，自动更新MD5并重新打包为.3mf"""
+        import hashlib
+        import re
+        import os
+        import zipfile
+
+        folder = QFileDialog.getExistingDirectory(self, t("gui.dialog.repack_select_folder"))
+        if not folder:
+            return
+
+        src_dir = Path(folder)
+        ct_path = src_dir / "[Content_Types].xml"
+        if not ct_path.exists():
+            QMessageBox.warning(self, t("gui.dialog.warning.title"), t("gui.dialog.repack_no_content_types"))
+            return
+
+        try:
+            # 更新所有 plate_N.gcode.md5
+            gcode_re = re.compile(r"^(.+[/\\])?Metadata[/\\]plate_(\d+)\.gcode$")
+            metadata_dir = src_dir / "Metadata"
+            if metadata_dir.is_dir():
+                for gcode_file in sorted(metadata_dir.glob("plate_*.gcode")):
+                    if not gcode_re.match(str(gcode_file)):
+                        continue
+                    h = hashlib.md5()
+                    with open(gcode_file, "rb") as f:
+                        h.update(f.read())
+                    md5_path = Path(str(gcode_file) + ".md5")
+                    md5_path.write_text(h.hexdigest(), encoding="ascii")
+
+            # 打包：[Content_Types].xml 必须是第一个条目
+            output = src_dir.parent / (src_dir.name.rstrip("/\\") + ".3mf")
+            with zipfile.ZipFile(output, "w", zipfile.ZIP_DEFLATED) as z:
+                z.write(ct_path, "[Content_Types].xml")
+                for root, _dirs, files in os.walk(str(src_dir)):
+                    for fn in files:
+                        fp = Path(root) / fn
+                        arcname = fp.relative_to(src_dir).as_posix()
+                        if arcname == "[Content_Types].xml":
+                            continue
+                        z.write(str(fp), arcname)
+
+            QMessageBox.information(
+                self,
+                t("gui.dialog.repack_success.title"),
+                t("gui.dialog.repack_success.text", path=str(output)),
+            )
+        except Exception as exc:
+            QMessageBox.critical(self, t("gui.dialog.warning.title"), str(exc))
+
     # =========================================================================
     # 文件输入管理（表格行操作）
     # =========================================================================
@@ -1421,6 +1479,7 @@ class MainWindow(QMainWindow):
         self.skip_duplicates_check.setText(t("gui.options.skip_duplicates"))
         self.bed_cooldown_suffix_label.setText(t("gui.options.bed_cooldown.suffix"))
         self.wait_suffix_label.setText(t("gui.options.wait_suffix"))
+        self.repack_3mf_button.setText(t("gui.options.repack_3mf"))
 
         # 元数据下拉框
         self.metadata_combo.setItemText(0, t("gui.options.metadata.source"))

a1_swap_mod_packer/i18n/en.json

@@ -95,5 +95,10 @@
   "gui.button.close": "Close",
   "gui.dialog.view_gcode.title": "View Swap G-code",
   "gui.options.view_gcode": "View",
-  "gui.dialog.build_result.title": "Build Result"
+  "gui.dialog.build_result.title": "Build Result",
+  "gui.options.repack_3mf": "Repack 3MF",
+  "gui.dialog.repack_select_folder": "Select unpacked 3MF folder",
+  "gui.dialog.repack_success.title": "Repack Complete",
+  "gui.dialog.repack_success.text": "3MF has been repacked:\n{path}",
+  "gui.dialog.repack_no_content_types": "[Content_Types].xml not found. Not a valid unpacked 3MF directory."
 }

a1_swap_mod_packer/i18n/zh_CN.json

@@ -95,5 +95,10 @@
   "format.unknown": "未知",
   "gui.button.close": "关闭",
   "gui.dialog.view_gcode.title": "查看换盘 G-code",
-  "gui.dialog.build_result.title": "构建结果"
+  "gui.dialog.build_result.title": "构建结果",
+  "gui.options.repack_3mf": "重新打包 3MF",
+  "gui.dialog.repack_select_folder": "选择解压后的 3MF 文件夹",
+  "gui.dialog.repack_success.title": "重新打包完成",
+  "gui.dialog.repack_success.text": "已重新打包为 3MF 文件：\n{path}",
+  "gui.dialog.repack_no_content_types": "未找到 [Content_Types].xml，不是有效的 3MF 解压目录。"
 }