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/quickstart.md

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+# Quickstart: Combatant Row Declutter
+
+**Feature**: 019-combatant-row-declutter
+**Date**: 2026-03-06
+
+## What This Feature Does
+
+Replaces always-visible HP adjustment controls and AC input with compact, on-demand interactions:
+1. **HP**: Click the current HP number to open a small popover for damage/healing.
+2. **AC**: Click the shield+number display to edit AC inline.
+
+## Key Files
+
+| File | Role |
+|------|------|
+| `apps/web/src/components/combatant-row.tsx` | Main combatant row — modified to use new patterns |
+| `apps/web/src/components/hp-adjust-popover.tsx` | New popover component for HP adjustment |
+| `apps/web/src/components/quick-hp-input.tsx` | Removed — replaced by HP popover |
+
+## How It Works
+
+### HP Adjustment Flow
+1. Current HP displays as a clickable, color-coded number (amber=bloodied, red=unconscious)
+2. Click opens a popover with auto-focused numeric input + Damage/Heal buttons
+3. Enter = apply damage (negative delta), Shift+Enter = apply healing (positive delta)
+4. Popover dismisses on action, Escape, or click-outside
+
+### AC Edit Flow
+1. AC displays as static text: shield icon + number (or just shield if unset)
+2. Click opens inline input (same pattern as editable name)
+3. Enter/blur commits, Escape cancels
+
+## Development
+
+```bash
+pnpm --filter web dev     # Start dev server
+pnpm check                # Run full quality gate before committing
+```
+
+## Constraints
+
+- Domain and application layers are unchanged
+- `onAdjustHp` and `onSetAc` callback signatures unchanged
+- Max HP input remains always-visible