With a bound project the settings dialog omits a blank directory from the PATCH and rename_board mirrors the project's primary folder, so clearing the field cannot fall back to scratch until the project is unbound; the Settings bullet now says so. The bundle test drops five wording-level substring asserts that pinned the payload shape already covered behaviourally by test_kanban_board_project_api.py, keeping only the switcher's unbind seam.
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