FEAR stains the forbidden ground in the cockpit too

The aura's warp-walking diamond — dreadDistance ≤ 3, extracted to one
shared fearCells so the board's dashed ring, the cockpit's floor stain,
and the engine's refusal can never disagree — now tints the flagstones
violet in first person, breathing like the board's aura, beneath the
dread ring already at the bearer's feet.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015RCWSTnb1KYTPyL4GmhGnF

packages/engine/src/view.ts

@@ -16,6 +16,7 @@ import {
   type SustainedEffect,
   type TreasureState,
   type TurnState,
+  dreadDistance,
 } from "./game";
 
 export interface PlayerPublicView {
@@ -193,6 +194,22 @@ export function viewFor(state: GameState, playerId: PlayerId): GameView {
  * reflects what this player knows (illusion walls they believe in block it).
  * The basis for the client's "dim the ineligible squares" targeting aid.
  */
+/** Every square inside a living FEAR-bearer's aura — dreadDistance walks
+ * through warps, the engine's own yardstick, so the painted aura and the
+ * movement refusal can never disagree. */
+export function fearCells(view: GameView): Set<string> {
+  const out = new Set<string>();
+  for (const fp of view.players) {
+    if (!fp.alive) continue;
+    if (!view.sustained.some((e) => e.cardId === "fear" && e.targetId === fp.id)) continue;
+    for (const k of Object.keys(view.board.cells)) {
+      const [x, y] = k.split(",").map(Number) as [number, number];
+      if (dreadDistance(view.board, fp.position, { x, y }) <= 3) out.add(k);
+    }
+  }
+  return out;
+}
+
 export function sightedCellsFor(view: GameView): Set<string> {
   const out = new Set<string>();
   const me = view.players.find((p) => p.id === view.you);