chore(ruff): Manual fixes for workspace/builder.py

src/tmuxp/workspace/builder.py:258:9: B018 Found useless expression. Either assign it to a variable or remove it.
src/tmuxp/workspace/builder.py:456:45: B023 Function definition does not bind loop variable `pane_config`
src/tmuxp/workspace/builder.py:457:32: B023 Function definition does not bind loop variable `pane_config`
src/tmuxp/workspace/builder.py:464:35: B023 Function definition does not bind loop variable `pane_config`
src/tmuxp/workspace/builder.py:465:32: B023 Function definition does not bind loop variable `pane_config`

Author: tony

src/tmuxp/workspace/builder.py

@@ -255,7 +255,7 @@ def build(self, session: t.Optional[Session] = None, append: bool = False) -> No
         assert session.server is not None
 
         self.server: "Server" = session.server
-        self.server.sessions
+        assert self.server.sessions is not None
         assert self.server.has_session(session.name)
         assert session.id
 
@@ -452,15 +452,19 @@ def iter_create_panes(
                 pane = window.attached_pane
             else:
 
-                def get_pane_start_directory():
+                def get_pane_start_directory(
+                    pane_config: t.Dict[str, str], window_config: t.Dict[str, str]
+                ) -> t.Optional[str]:
                     if "start_directory" in pane_config:
                         return pane_config["start_directory"]
                     elif "start_directory" in window_config:
                         return window_config["start_directory"]
                     else:
                         return None
 
-                def get_pane_shell():
+                def get_pane_shell(
+                    pane_config: t.Dict[str, str], window_config: t.Dict[str, str]
+                ) -> t.Optional[str]:
                     if "shell" in pane_config:
                         return pane_config["shell"]
                     elif "window_shell" in window_config:
@@ -486,8 +490,14 @@ def get_pane_shell():
 
                 pane = window.split_window(
                     attach=True,
-                    start_directory=get_pane_start_directory(),
-                    shell=get_pane_shell(),
+                    start_directory=get_pane_start_directory(
+                        pane_config=pane_config,
+                        window_config=window_config,
+                    ),
+                    shell=get_pane_shell(
+                        pane_config=pane_config,
+                        window_config=window_config,
+                    ),
                     target=pane.id,
                     environment=environment,
                 )