Improve PF2e stat block action icons, triggers, and tag handling

- Replace unicode action cost chars with custom SVG icons (diamond
  with chevron for actions, outlined diamond for free, curved arrow
  for reaction) rendered inline via ActivityCost on TraitBlock
- Add activity icons to attacks (all Strikes default to single action)
- Add trigger/effect rendering for reaction abilities (bold labels)
- Fix nested tag stripping ({@b ...{@spell ...}...}) by looping
- Move icon after ability name to match AoN format

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/domain/src/creature-types.ts

@@ -14,8 +14,15 @@ export interface TraitListItem {
 	readonly text: string;
 }
 
+export interface ActivityCost {
+	readonly number: number;
+	readonly unit: "action" | "free" | "reaction";
+}
+
 export interface TraitBlock {
 	readonly name: string;
+	readonly activity?: ActivityCost;
+	readonly trigger?: string;
 	readonly segments: readonly TraitSegment[];
 }
 

packages/domain/src/index.ts

@@ -24,6 +24,7 @@ export {
 	createPlayerCharacter,
 } from "./create-player-character.js";
 export {
+	type ActivityCost,
 	type AnyCreature,
 	type BestiaryIndex,
 	type BestiaryIndexEntry,