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/zotero.py

@@ -1,4 +1,5 @@
 from dataclasses import dataclass
+from typing import Optional
 
 from pyzotero import zotero
 
@@ -12,11 +13,11 @@ class Creator:
     lastName: str = None
     creatorType: str = "author"
 
-    def from_dict(self, data: dict):
+    def from_dict(self, data: dict) -> None:
         for key, value in data.items():
             setattr(self, key, value)
 
-    def from_string(self, data: str):
+    def from_string(self, data: str) -> "Creator":
         if "," in data:
             self.firstName = data.split(",")[1]
             self.lastName = data.split(",")[0]
@@ -56,7 +57,7 @@ class Book:
     rights: str = None
     extra: str = None
 
-    def to_dict(self):
+    def to_dict(self) -> dict:
         ret = {}
         for key, value in self.__dict__.items():
             if value:
@@ -95,14 +96,14 @@ class BookSection:
     collections = list
     relations = dict
 
-    def to_dict(self):
+    def to_dict(self) -> dict:
         ret = {}
         for key, value in self.__dict__.items():
             if value:
                 ret[key] = value
         return ret
 
-    def assign(self, book):
+    def assign(self, book) -> None:
         for key, value in book.__dict__.items():
             if key in self.__dict__.keys():
                 try:
@@ -142,14 +143,14 @@ class JournalArticle:
     collections = list
     relations = dict
 
-    def to_dict(self):
+    def to_dict(self) -> dict:
         ret = {}
         for key, value in self.__dict__.items():
             if value:
                 ret[key] = value
         return ret
 
-    def assign(self, book: dict):
+    def assign(self, book: dict) -> None:
         for key, value in book.__dict__.items():
             if key in self.__dict__.keys():
                 try:
@@ -164,15 +165,15 @@ class ZoteroController:
     def __init__(self):
         if self.zoterocfg.library_id is None:
             return
-        self.zot = zotero.Zotero(
+        self.zot = zotero.Zotero(  # type: ignore
             self.zoterocfg.library_id,
             self.zoterocfg.library_type,
             self.zoterocfg.api_key,
         )
 
-    def get_books(self):
+    def get_books(self) -> list:
         ret = []
-        items = self.zot.top()
+        items = self.zot.top()  # type: ignore
         for item in items:
             if item["data"]["itemType"] == "book":
                 ret.append(item)
@@ -180,7 +181,7 @@ class ZoteroController:
 
     # create item in zotero
     # item is a part of a book
-    def __get_data(self, isbn):
+    def __get_data(self, isbn) -> dict:
         web = WebRequest()
         web.get_ppn(isbn)
         data = web.get_data_elsa()
@@ -190,7 +191,7 @@ class ZoteroController:
         return book
 
     # # #print(zot.item_template("bookSection"))
-    def createBook(self, isbn):
+    def createBook(self, isbn) -> Book:
         book = self.__get_data(isbn)
 
         bookdata = Book()
@@ -209,23 +210,23 @@ class ZoteroController:
         bookdata.creators = authors
         return bookdata
 
-    def createItem(self, item):
-        resp = self.zot.create_items([item])
+    def createItem(self, item) -> Optional[str]:
+        resp = self.zot.create_items([item])  # type: ignore
         if "successful" in resp.keys():
             # #print(resp["successful"]["0"]["key"])
             return resp["successful"]["0"]["key"]
         else:
             return None
 
-    def deleteItem(self, key):
+    def deleteItem(self, key) -> None:
         items = self.zot.items()
         for item in items:
             if item["key"] == key:
-                self.zot.delete_item(item)
+                self.zot.delete_item(item)  # type: ignore
                 # #print(item)
                 break
 
-    def createHGSection(self, book: Book, data: dict):
+    def createHGSection(self, book: Book, data: dict) -> Optional[str]:
         chapter = BookSection()
         chapter.assign(book)
         chapter.pages = data["pages"]
@@ -247,7 +248,7 @@ class ZoteroController:
         return self.createItem(chapter.to_dict())
         pass
 
-    def createBookSection(self, book: Book, data: dict):
+    def createBookSection(self, book: Book, data: dict) -> Optional[str]:
         chapter = BookSection()
         chapter.assign(book)
         chapter.pages = data["pages"]
@@ -258,7 +259,7 @@ class ZoteroController:
         return self.createItem(chapter.to_dict())
         # chapter.creators
 
-    def createJournalArticle(self, journal, article):
+    def createJournalArticle(self, journal, article) -> Optional[str]:
         # #print(type(article))
         journalarticle = JournalArticle()
         journalarticle.assign(journal)
@@ -279,8 +280,8 @@ class ZoteroController:
 
         return self.createItem(journalarticle.to_dict())
 
-    def get_citation(self, item):
-        title = self.zot.item(
+    def get_citation(self, item) -> str:
+        title = self.zot.item(  # type: ignore
             item,
             content="bib",
             style="deutsche-gesellschaft-fur-psychologie",