chore(fix): Resolve regressions in history logic, track startup, and GUI performance

src/history.py

@@ -16,6 +16,7 @@ class UISnapshot:
  auto_add_history: bool
  disc_entries: list[dict]
  files: list[dict]
+ context_files: list[dict]
  screenshots: list[str]
 
  def to_dict(self) -> dict:
@@ -34,6 +35,7 @@ class UISnapshot:
    "auto_add_history": self.auto_add_history,
    "disc_entries": self.disc_entries,
    "files": self.files,
+   "context_files": self.context_files,
    "screenshots": self.screenshots
   }
 
@@ -54,6 +56,7 @@ class UISnapshot:
    auto_add_history=data.get("auto_add_history", False),
    disc_entries=data.get("disc_entries", []),
    files=data.get("files", []),
+   context_files=data.get("context_files", []),
    screenshots=data.get("screenshots", [])
   )