Clicking a board card opens its detail in a full main-content view (replacing the board) with a 'Back to board' button, instead of the TaskDetailModal overlay. Only the Board entry point changes; list-view embed, right-dock cards, and other openDetail callers keep the modal. New 'task-detail' task view; embedded TaskDetailContent prefers the live task. Works within the mobile shell (swipe-back reverts to board). Tests updated (70 pass).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>