[DYN-012] Deck presentation

[veryCrunchy]

Roadmap

• Task ID: DYN-012
• Priority: P0

Implemented

• Native boards, stacks, and cards
• Drag, reorder, and cross-stack card movement
• Assignees, labels, due dates, comments, and attachments
• Native card, stack, relationship, and due-date editing flows
• Reusable board interactions for compatible non-Deck data
• Deterministic desktop and mobile visual coverage

Remaining validation

• Verify interaction and state preservation across Android rotation.
• Verify the large-screen Android layout and drag interactions.
• Exercise destructive or ambiguous write operations against a disposable test account.

The implementation landed in PR #221. This issue remains open until the final device and mutation-safety checks pass.