Refactor and enhance type hints across multiple modules

- Updated the `from_tuple` method in `Prof` class to specify return type.
- Added type hints for various methods in `LehmannsClient`, `OpenAI`, `WebRequest`, and `ZoteroController` classes to improve code clarity and type safety.
- Modified `pdf_to_csv` function to return a string instead of a DataFrame.
- Enhanced error handling and type hints in `wordparser` and `xmlparser` modules.
- Removed unused UI file `Ui_medianadder.ts`.
- Improved the layout and structure of the `semesterapparat_ui` to enhance user experience.
- Updated file picker to support `.doc` files in addition to `.docx`.
- Added unique item handling in `Ui` class to prevent duplicates in apparat list.
- General code cleanup and consistency improvements across various files.

src/logic/xmlparser.py

@@ -56,8 +56,8 @@ def eml_parser(path: str) -> XMLMailSubmission:
     return parse_xml_submission(xml_content)
 
 
-def eml_to_semap(path: str) -> SemapDocument:
-    submission = eml_parser(path)
+def eml_to_semap(xml_mail: XMLMailSubmission) -> SemapDocument:
+    submission = eml_parser(xml_mail)
     semap_doc = SemapDocument(
         # prof=Prof(name=submission.name, lastname=submission.lastname, email=submission.email),
         apparat=Apparat(name=submission.app_name, subject=submission.subject),