[Secondary] UI Focus & Gamepad Card Hand Navigation

[MeriAlguero]

[Secondary] UI Focus & Gamepad Card Hand Navigation

Priority: Secondary / Post-MVP
Labels: enhancement, ui, secondary

Summary

Enable full UI navigation via gamepad so players can navigate, select, play, and discard cards without needing a mouse cursor.

Tasks

• Configure Unity EventSystem with InputSystemUIInputModule.
• Implement dynamic UI focus routing when transitioning between Board Mode (Grid Cursor) and Hand Mode (Card Selection).
• Add explicit navigation rules for Card UI buttons so pressing Left/Right on D-Pad switches between cards in hand.
• Bind LB/RB or D-Pad Down/Up to switch input context between the Board and the Hand.
• Pressing Submit (A) on a focused card plays or targets with that card.

Acceptance Criteria

• Players can switch focus seamlessly between board grid navigation and hand card selection using gamepad buttons.
• Focused UI cards display clear visual selection feedback (e.g., card scales up or highlights).
• Pressing A on a card triggers its action capability using gamepad input.