Trello: reimport task when card moves back to an active column

When a task linked to a Trello card is marked as done in Akiflow, but the card is later moved back to an active column/stage in Trello (e.g. back to "In Progress" or "To Do"), the task should be re-imported or reactivated in Akiflow accordingly.

Currently the Trello integration does not support this granular stage-based reimport behavior — once a task is completed in Akiflow, changes to the Trello card column do not trigger a reimport. A sync that respects column/stage transitions (not just done/not-done) would make the integration much more powerful for users with complex Trello workflows.

Originally requested by jj@cloudrendr.com via support chat.