# Data Model: Inline HP Delta Input

## No data model changes

This feature does not modify any domain entities, events, or state transitions. The existing data model fully supports the new UI:

### Existing Entities (unchanged)

**Combatant**
- `id`: CombatantId (branded string)
- `name`: string
- `initiative?`: number
- `maxHp?`: number
- `currentHp?`: number

**Encounter**
- `combatants`: readonly Combatant[]
- `activeIndex`: number
- `roundNumber`: number

### Existing Domain Function (unchanged)

**adjustHp(encounter, combatantId, delta) -> AdjustHpSuccess | DomainError**
- Negative delta = damage, positive delta = heal
- Clamps result to [0, maxHp]
- Emits `CurrentHpAdjusted` event

### Existing Domain Event (unchanged)

**CurrentHpAdjusted**
- `combatantId`: CombatantId
- `previousHp`: number
- `newHp`: number
- `delta`: number

### UI State Changes

The only state change is in the QuickHpInput component:
- **Removed**: `mode: "damage" | "heal"` state variable
- **Kept**: `value: string` state variable for the input field

The action (damage vs heal) is now determined at invocation time by which button/key triggered it, not by a stored mode.