Feature request: Option to propagate parent issue status changes to all sub-issues

Problem

When the status of a parent issue is changed (e.g., from 'Todo' to 'Done'), its sub-issues do not get updated automatically. Each sub-issue has to be updated manually, which is tedious and error-prone for issues with many children.

Suggested solution

Provide at least one of the following:

1. Automatic propagation: Changing the status of a parent issue automatically applies the same status to all of its sub-issues.
2. Optional propagation: Add an option (e.g., a toggle or a prompt) that asks whether the status change should cascade to sub-issues when changing a parent's status.

An option (rather than unconditional automatic behavior) is probably safer, since users may want different statuses on sub-issues in some workflows (e.g., blocking states).

Additional context

• This would be very useful for hierarchies where sub-issues are steps of a larger task.
• Similarly, unassigning or other bulk operations on parents could also be considered for propagation.

Start by tracing how parent issue status changes and sub-issue relationships are handled across the project. Review the existing status-update flow and any related UI or API entry points. Done should mean a clearly chosen automatic or optional propagation behavior updates sub-issues safely while preserving workflows that require different statuses.