# Access (.accdb) VBA Code Export/Import Support Design

## Summary

Extend the existing `extract_vba.py` and `import_vba.py` to support Access `.accdb` files alongside Excel `.xlsm` files. The file type is auto-detected by extension via a unified `TARGET_FILE` env variable.

## Key COM Differences

| Dimension | Excel (.xlsm) | Access (.accdb) |
|-----------|---------------|-----------------|
| ProgID | `Excel.Application` | `Access.Application` |
| Open | `Workbooks.Open(path)` | `OpenCurrentDatabase(path)` |
| VBA Project | `workbook.VBProject` | `CurrentDb().VBE.VBProjects(1)` |
| Close | `workbook.Close()` + `Quit()` | `CloseCurrentDatabase()` + `Quit()` |
| Module types | Standard/Class/Document/Forms | Standard/Class only |

## Changes

### .env
- Replace `TARGET_XLSM_FILE` with `TARGET_FILE` (supports `.xlsm` and `.accdb`)

### extract_vba.py
- Replace `TARGET_XLSM_FILE` with `TARGET_FILE`
- Add `extract_vba_modules_access_com()` method to `VBAExtractor`
- Update `main()` to detect file type by extension and auto-select COM method
- Skip olevba option for `.accdb` files (unsupported)

### import_vba.py
- Replace `TARGET_XLSM_FILE` with `TARGET_FILE`
- Add `import_vba_access()` method to `VBAImporter`
- Update `main()` to detect file type by extension and route accordingly

## Out of Scope
- Access Forms/Reports VBA code (user doesn't need it)
- olevba for Access files (unsupported)
- Directory structure changes (Modules/ClassModules sufficient)