Notify User When Feedback Status Changes

As a feedback submitter I want to receive a notification when an admin changes my feedback status (e.g., from "Under Review" → "Planned") So that I know my idea is being taken seriously and can track progress without manually checking Acceptance Criteria: Notification triggers on status transitions (new→under_review, under_review→planned, →in_progress, →done, →declined) Notification includes the new status and (optionally) admin's reason Notification appears in the in-app bell icon + email (if user has email notifications enabled) User can disable these notifications in settings Admins leaving an admin_response also triggers a notification