Combat: condition dropdown picker with tag chips

- System-aware condition list (5e PHB / pf2e) in src/lib/rules/conditions.ts
- Dropdown replaces free-text input; non-valued conditions add instantly,
  valued ones (Exhaustion, Frightened N, etc.) show a value field, plus Custom
- Already-applied conditions disabled in the list; chips remain click-to-remove
- New e2e covering preset + valued add and tag removal

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/lib/rules/index.ts

@@ -19,3 +19,4 @@ export const SYSTEM_OPTIONS: { id: SystemId; label: string }[] = [
 export * from './types';
 export { abilityModifier, ABILITY_ABBR, ABILITY_LABELS, formatDamage } from './abilities';
 export { applyRest } from './rest';
+export { getConditions, CONDITIONS_5E, CONDITIONS_PF2E, type ConditionDef } from './conditions';