Nextcloud Deck Integration

[alainm23]

Full two-way synchronization between Planify and Nextcloud Deck, allowing users to manage their Deck boards, stacks, and cards directly from Planify.

• Board sync: Boards appear as projects in Planify with full CRUD support
• Stack sync: Stacks map to sections with order preservation
• Card sync: Cards map to items with title, description, due date, and completion status
• Label sync: Bidirectional label sync with automatic color conversion (Planify named colors ↔ Deck hex)
• Archive sync: Archive/unarchive boards from either Planify or Deck web
• Drag & Drop: Move cards between stacks with real-time sync to Deck
• Cross-board move: Move cards between different boards (creates on target, deletes from source)
• Section order sync: Reordering stacks in Planify reflects on Deck web
• Deletion sync: Deleting boards, stacks, or cards syncs both directions
• Offline resilience: Filters deleted items (deletedAt > 0) from server responses

Deck Limitations Handled

• No subtasks: Subtask UI and drop targets are hidden/disabled for Deck projects
• No cross-board move API: Handled via create + delete strategy
• No inbox section: Hidden for Deck projects

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