conductor(checkpoint): Checkpoint end of Phase 4 - UI Features & History List

src/history.py

@@ -112,3 +112,20 @@ class HistoryManager:
    {"description": e.description, "timestamp": e.timestamp}
    for e in self._undo_stack
   ]
+
+ def jump_to_undo(self, index: int, current_state: typing.Any, current_description: str = "Before Jump") -> typing.Optional[HistoryEntry]:
+  """
+  Jumps to a specific state in the undo stack by moving subsequent states
+  and the current_state to the redo stack.
+  """
+  if index < 0 or index >= len(self._undo_stack):
+   return None
+  
+  # Move current state to redo
+  self._redo_stack.append(HistoryEntry(state=current_state, description=current_description))
+  
+  # Move states between index and top of undo to redo
+  while len(self._undo_stack) > index + 1:
+   self._redo_stack.append(self._undo_stack.pop())
+   
+  return self._undo_stack.pop()