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Wire the F7 双链 + 无限便利贴 model (Board/LinkGraph) into a reachable screen. Previously the model existed but had no UI and no entry point. board_screen.dart: an infinite InteractiveViewer canvas of draggable, editable sticky cards. Card text renders [[links]] as tappable chips that pan to the target card (dangling links styled apart). A backlinks panel lists "linked from" via backlinksOf. "Add card" FAB drops a card at the viewport center. Persistence: a board_cards table (DB v7), one row per card, debounced 800ms like the ink editors, loaded on open — boards survive restart. Entry added to the home screen app bar (dashboard_customize icon). Ink-on-cards, multi-board management and link autocomplete are deferred (TODO board-ink / board-multi / board-link-autocomplete). analyze clean, 285 tests green.