Refactor radar system

python_app/orchestration/gui_session_state.py

@@ -7,6 +7,7 @@ import json
 import logging
 from pathlib import Path
 
+from python_app.file_io import atomic_write_json
 logger = logging.getLogger(__name__)
 
 
@@ -37,7 +38,7 @@ class GuiSessionStateStore:
 
         try:
             payload = json.loads(self._path.read_text(encoding="utf-8"))
-        except (OSError, json.JSONDecodeError) as exc:
+        except (OSError, UnicodeError, json.JSONDecodeError) as exc:
             # The state file is GUI-local cache — a corrupted file should not
             # prevent the app from starting. Reset to defaults and let the
             # next write overwrite it.
@@ -55,11 +56,6 @@ class GuiSessionStateStore:
 
     def write(self, state: GuiSessionState) -> Path:
         """Atomically write session-state JSON file."""
-        temp_path = self._path.with_suffix(self._path.suffix + ".tmp")
-        temp_path.write_text(
-            json.dumps({"last_profile_path": state.last_profile_path}, indent=2),
-            encoding="utf-8",
-        )
-        temp_path.replace(self._path)
+        atomic_write_json(self._path, {"last_profile_path": state.last_profile_path}, durable=True)
         logger.debug("Wrote GUI session-state to %s", self._path)
         return self._path