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/web/src/Board.svelte

@@ -2,7 +2,7 @@
   import type { Component } from "svelte";
   import type { GameView, SightTrace } from "@wizwar/engine";
   import type { Side } from "@wizwar/engine";
-  import { dreadDistance } from "@wizwar/engine";
+  import { fearCells } from "@wizwar/engine";
   import type { BoardFx } from "./fx";
   import { colorIndexOf as sharedColorIndex, wizardColor } from "./colors";
   import { CREATURE_ART, objectArt, TERRAIN_ART, tokenArt } from "./art";
@@ -212,18 +212,7 @@
   // ("even if walls separate you"), never diagonally — and the maze wraps,
   // so the diamond continues from the opposite rim. The engine's own
   // yardstick, so the aura and the refusal can never disagree.
-  const fearCells = $derived.by(() => {
-    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;
-  });
+  const fearAura = $derived(fearCells(view));
 
   // Warp pairs share a letter, like the printed openings on the real boards.
   const warpLetters = $derived.by(() => {
@@ -692,7 +681,7 @@
     {/each}
   {/if}
   <!-- FEAR's bubble: the three-space diamond, through walls, wrapping the rim -->
-  {#each fearCells as key (key)}
+  {#each fearAura as key (key)}
     {@const bx = Number(key.split(",")[0])}
     {@const by = Number(key.split(",")[1])}
     <rect x={bx * CELL + 1.5} y={by * CELL + 1.5} width={CELL - 3} height={CELL - 3}