Add Pathfinder 2e game system mode

Implements PF2e as an alternative game system alongside D&D 5e/5.5e.
Settings modal "Game System" selector switches conditions, bestiary,
stat block layout, and initiative calculation between systems.

- Valued conditions with increment/decrement UX (Clumsy 2, Frightened 3)
- 2,502 PF2e creatures from bundled search index (77 sources)
- PF2e stat block: level, traits, Perception, Fort/Ref/Will, ability mods
- Perception-based initiative rolling
- System-scoped source cache (D&D and PF2e sources don't collide)
- Backwards-compatible condition rehydration (ConditionId[] → ConditionEntry[])
- Difficulty indicator hidden in PF2e mode (excluded from MVP)

Closes dostulata/initiative#19

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

apps/web/src/hooks/use-encounter.ts

@@ -4,11 +4,13 @@ import {
 	adjustHpUseCase,
 	advanceTurnUseCase,
 	clearEncounterUseCase,
+	decrementConditionUseCase,
 	editCombatantUseCase,
 	redoUseCase,
 	removeCombatantUseCase,
 	retreatTurnUseCase,
 	setAcUseCase,
+	setConditionValueUseCase,
 	setCrUseCase,
 	setHpUseCase,
 	setInitiativeUseCase,
@@ -19,7 +21,6 @@ import {
 	undoUseCase,
 } from "@initiative/application";
 import type {
-	BestiaryIndexEntry,
 	CombatantId,
 	CombatantInit,
 	ConditionId,
@@ -40,6 +41,7 @@ import {
 } from "@initiative/domain";
 import { useCallback, useEffect, useReducer, useRef } from "react";
 import { useAdapters } from "../contexts/adapter-context.js";
+import type { SearchResult } from "./use-bestiary.js";
 
 // -- Types --
 
@@ -61,14 +63,25 @@ type EncounterAction =
 			id: CombatantId;
 			conditionId: ConditionId;
 	  }
+	| {
+			type: "set-condition-value";
+			id: CombatantId;
+			conditionId: ConditionId;
+			value: number;
+	  }
+	| {
+			type: "decrement-condition";
+			id: CombatantId;
+			conditionId: ConditionId;
+	  }
 	| { type: "toggle-concentration"; id: CombatantId }
 	| { type: "clear-encounter" }
 	| { type: "undo" }
 	| { type: "redo" }
-	| { type: "add-from-bestiary"; entry: BestiaryIndexEntry }
+	| { type: "add-from-bestiary"; entry: SearchResult }
 	| {
 			type: "add-multiple-from-bestiary";
-			entry: BestiaryIndexEntry;
+			entry: SearchResult;
 			count: number;
 	  }
 	| { type: "add-from-player-character"; pc: PlayerCharacter }
@@ -156,7 +169,7 @@ function resolveAndRename(store: EncounterStore, name: string): string {
 
 function addOneFromBestiary(
 	store: EncounterStore,
-	entry: BestiaryIndexEntry,
+	entry: SearchResult,
 	nextId: number,
 ): {
 	cId: CreatureId;
@@ -215,7 +228,7 @@ function handleUndoRedo(
 
 function handleAddFromBestiary(
 	state: EncounterState,
-	entry: BestiaryIndexEntry,
+	entry: SearchResult,
 	count: number,
 ): EncounterState {
 	const { store, getEncounter } = makeStoreFromState(state);
@@ -325,6 +338,8 @@ function dispatchEncounterAction(
 		| { type: "set-cr" }
 		| { type: "set-side" }
 		| { type: "toggle-condition" }
+		| { type: "set-condition-value" }
+		| { type: "decrement-condition" }
 		| { type: "toggle-concentration" }
 	>,
 ): EncounterState {
@@ -373,6 +388,17 @@ function dispatchEncounterAction(
 		case "toggle-condition":
 			result = toggleConditionUseCase(store, action.id, action.conditionId);
 			break;
+		case "set-condition-value":
+			result = setConditionValueUseCase(
+				store,
+				action.id,
+				action.conditionId,
+				action.value,
+			);
+			break;
+		case "decrement-condition":
+			result = decrementConditionUseCase(store, action.id, action.conditionId);
+			break;
 		case "toggle-concentration":
 			result = toggleConcentrationUseCase(store, action.id);
 			break;
@@ -522,6 +548,16 @@ export function useEncounter() {
 				dispatch({ type: "toggle-condition", id, conditionId }),
 			[],
 		),
+		setConditionValue: useCallback(
+			(id: CombatantId, conditionId: ConditionId, value: number) =>
+				dispatch({ type: "set-condition-value", id, conditionId, value }),
+			[],
+		),
+		decrementCondition: useCallback(
+			(id: CombatantId, conditionId: ConditionId) =>
+				dispatch({ type: "decrement-condition", id, conditionId }),
+			[],
+		),
 		toggleConcentration: useCallback(
 			(id: CombatantId) => dispatch({ type: "toggle-concentration", id }),
 			[],
@@ -530,15 +566,12 @@ export function useEncounter() {
 			() => dispatch({ type: "clear-encounter" }),
 			[],
 		),
-		addFromBestiary: useCallback(
-			(entry: BestiaryIndexEntry): CreatureId | null => {
-				dispatch({ type: "add-from-bestiary", entry });
-				return null;
-			},
-			[],
-		),
+		addFromBestiary: useCallback((entry: SearchResult): CreatureId | null => {
+			dispatch({ type: "add-from-bestiary", entry });
+			return null;
+		}, []),
 		addMultipleFromBestiary: useCallback(
-			(entry: BestiaryIndexEntry, count: number): CreatureId | null => {
+			(entry: SearchResult, count: number): CreatureId | null => {
 				dispatch({
 					type: "add-multiple-from-bestiary",
 					entry,