refactor: add assurance 1 version check

Assurance 1 was introduced with library version 101, specifically commmit 12e074b71d.
Thus all libraries created on version 101 and above already fullfill it and don't need it.
Furthermore, it only fails if the library didn't need the assurance, meaning the try-except and warning catching can be removed

src/tagstudio/core/library/alchemy/library.py

@@ -538,7 +538,6 @@ class Library:
         return LibraryStatus(success=True, library_path=library_dir)
 
     def migrate_lib(self, library_dir: Path, storage_path: str) -> LibraryStatus:
-        is_new = False
         connection_string = URL.create(
             drivername="sqlite",
             database=storage_path,
@@ -591,24 +590,18 @@ class Library:
         # without considering what version the DB is currently on and then doing all of the
         # migrations after that seems like it could cause problems in some scenarios.
         # instead only have this on creation and create new tables as part of migrations
+        # Note: this actually produces an error and fails to initialise built-in tags when opening
+        # a library that doesn't yet have the is_hidden property on the tags table
         make_tables(self.engine)
 
         with Session(self.engine) as session:
-            # TODO ASSURANCE 1: version check + reordering
+            # TODO ASSURANCE 1: reordering
             # Ensure version rows are present
-            with catch_warnings(record=True):
-                try:
-                    initial = DB_VERSION if is_new else 100
-                    session.add(Version(key=DB_VERSION_INITIAL_KEY, value=initial))
-                    session.commit()
-                except IntegrityError:
-                    session.rollback()
+            if loaded_db_version < 101:
+                session.add(Version(key=DB_VERSION_INITIAL_KEY, value=100))
 
-                try:
-                    session.add(Version(key=DB_VERSION_CURRENT_KEY, value=DB_VERSION))
-                    session.commit()
-                except IntegrityError:
-                    session.rollback()
+                session.add(Version(key=DB_VERSION_CURRENT_KEY, value=DB_VERSION))
+                session.commit()
 
             # TODO ASSURANCE 2: version check + reordering
             # check if folder matching current path exists already