feat: Implement core game engine logic, high-velocity UX, and new UI components including radial menu, inspector overlay, and mulligan view.

docs/development/devlog/2024-12-18-193000_strict_blocking_ui.md

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+# Strict Rules & Blocking UI (Part 3)
+
+## Status: Completed
+
+## Objectives
+- Integrate Strict Actions (`PLAY_LAND`, `CAST_SPELL`) with precise positioning.
+- Implement Blocking UI including visual feedback (Attacking/Blocking badges, Rings).
+- Implement Drag-and-Drop Targeting Logic (Spell -> Target, Blocker -> Attacker).
+- Implement Visual "Targeting Tether" overlay.
+
+## Implementation Details
+
+### Backend (Rules Engine)
+- **Positioning**: Updated `playLand` and `castSpell` to accept `{x, y}` coordinates.
+- **Stack Resolution**: Updated `resolveTopStack` to respect the stored resolution position when moving cards to the battlefield.
+- **Action Handling**: Updated `GameManager` to pass `position` payload to the engine.
+
+### Frontend (GameView)
+- **Drop Logic**:
+  - `handleZoneDrop`: Detects drop on "Battlefield". Differentiates Land (Play) vs Spell (Cast). Calculates relative % coordinates.
+  - `handleCardDrop`: Detects drop on a Card.
+    - If `declare_blockers` step: Assigns blocker (drag My Creature -> Opponent Creature).
+    - Else: Casts Spell with Target.
+  - `handlePlayerDrop`: Detects drop on Opponent Avatar -> Cast Spell with Target Player.
+- **Blocking Visualization**:
+  - **Opponent Cards**: Show "ATTACKING" badge (Red Ring + Shadow) if `attacking === property`.
+  - **My Cards**: Show "Blocking" badge (Blue Ring) if in local `proposedBlockers` map.
+- **Targeting Tether**:
+  - Implemented `tether` state (`startX`, `currentX`, etc.).
+  - Added `onDrag` handler to `CardComponent` to track HTML5 DnD movement.
+  - Rendered Full-screen SVG overlay with Bezier curve (`Q` command) and arrow marker.
+  - Dynamic styling: Cyan (Spells) vs Blue (Blocking).
+
+## Next Steps
+- **Layer System**: Implement 7-layer P/T calculation for accurate power/toughness display.
+- **Mulligan System**: Implement Strict Mulligan rules.
+- **Token Creation**: Support creating tokens.