Combat UI Pattern A - Split-Panel Implementation

This skill guides implementation of the Split-Panel Combat UI, transforming the vertical theater mode into a horizontal confrontation layout.

Architecture Overview

┌───────────────────────────────────────────────────┐
│  TURN INDICATOR  │  PHASE PIPELINE  │  MODIFIERS  │  ← PhaseHeader
├──────────────────┴───────┬───────────┴────────────┤
│                          │                        │
│     PLAYER PANEL         │     ENEMY PANEL        │  ← ConfrontationZone
│     (CharacterPanel)     │     (CharacterPanel)   │
│                          │                        │
├──────────────────────────┴────────────────────────┤
│  QUICK ACTIONS (SIDE/TOGGLE)  │   MAIN ACTIONS    │  ← ActionDock
└───────────────────────────────┴───────────────────┘