test(workspace_profile): add str/bytes TOML serialization contract test

tests/test_workspace_profile_serialization.py

@@ -0,0 +1,55 @@
+import io
+import tomllib
+import pytest
+import tomli_w
+from src.models import WorkspaceProfile
+
+
+def test_workspace_profile_empty_ini_content_roundtrips():
+  profile = WorkspaceProfile(
+   name="t",
+   ini_content="",
+   show_windows={"A": True, "B": False},
+   panel_states={"x": 1, "y": 2.0, "z": True},
+  )
+  d = profile.to_dict()
+  buf = io.BytesIO()
+  tomli_w.dump({"t": d}, buf)
+  buf.seek(0)
+  back = tomllib.load(buf)
+  loaded = WorkspaceProfile.from_dict("t", back["t"])
+  assert loaded.ini_content == ""
+  assert loaded.show_windows == {"A": True, "B": False}
+  assert loaded.panel_states == {"x": 1, "y": 2.0, "z": True}
+
+
+def test_workspace_profile_with_actual_ini_content_roundtrips():
+  profile = WorkspaceProfile(
+   name="real",
+   ini_content="[Window][Debug]\nPos=10,20\n",
+   show_windows={},
+   panel_states={},
+  )
+  d = profile.to_dict()
+  buf = io.BytesIO()
+  tomli_w.dump({"real": d}, buf)
+  buf.seek(0)
+  back = tomllib.load(buf)
+  loaded = WorkspaceProfile.from_dict("real", back["real"])
+  assert loaded.ini_content == "[Window][Debug]\nPos=10,20\n"
+  assert loaded.name == "real"
+  assert loaded.show_windows == {}
+  assert loaded.panel_states == {}
+
+
+def test_workspace_profile_bytes_ini_content_rejected_by_toml():
+  profile = WorkspaceProfile(
+   name="bad",
+   ini_content=b"",
+   show_windows={},
+   panel_states={},
+  )
+  d = profile.to_dict()
+  buf = io.BytesIO()
+  with pytest.raises(TypeError, match="bytes"):
+   tomli_w.dump({"bad": d}, buf)