Implement the 019-combatant-row-declutter feature that replaces always-visible HP controls and AC/MaxHP inputs with compact click-to-edit and click-to-adjust patterns in the encounter tracker

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

specs/019-combatant-row-declutter/data-model.md

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+# Data Model: Combatant Row Declutter
+
+**Feature**: 019-combatant-row-declutter
+**Date**: 2026-03-06
+
+## No Data Model Changes
+
+This feature is a purely visual/interaction refactor within the web adapter layer. No domain entities, application state, or persistence formats are affected.
+
+### Existing entities (unchanged)
+
+- **Combatant**: `id`, `name`, `initiative`, `maxHp`, `currentHp`, `ac`, `conditions`, `isConcentrating` — no fields added, removed, or modified.
+
+### Existing callbacks (unchanged)
+
+- `onAdjustHp(id: CombatantId, delta: number)` — same signature, now triggered from popover instead of inline QuickHpInput.
+- `onSetAc(id: CombatantId, value: number | undefined)` — same signature, now triggered from click-to-edit instead of always-visible input.
+
+### UI State (component-local only)
+
+New component-local state introduced in the HP popover (not persisted):
+- **popoverOpen**: boolean — whether the HP adjustment popover is visible.
+- **inputValue**: string — the draft delta value in the popover input.
+
+New component-local state in the AC click-to-edit (not persisted):
+- **editing**: boolean — whether the inline AC edit input is visible.
+- **draft**: string — the draft AC value being edited.
+
+These follow the same patterns as existing component-local state (`EditableName.editing`, `ConditionPicker` open state).