Credibility pass: the illusion tests roll both ways, and the seams from the last batch are sanded

Scope: 66b5c06..HEAD.

- The rev-27 illusion tests search seeds for a believed and a doubted
  roll and assert fixed life totals; seed 42 alone never believed, so
  the BLUNT pricing went unchecked.
- Three docblocks stranded above newly inserted functions are back on
  their own (openCreatureStack, resolvedBlow, castTrace).
- POWER ATTACK's life trade is one helper instead of three copies; the
  goat's charge distance is one helper for its validator, its ram and
  its pricing.
- The family list loads once into a shared store; the lobby and gallery
  share one talk filter; Board uses the engine's neighbor().
- A creature's blow shows the card that summoned it by the creature's
  kind, not by matching the blow's display name.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG

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 { edgeKey, fearCells } from "@wizwar/engine";
+  import { edgeKey, fearCells, neighbor } from "@wizwar/engine";
   import type { BoardFx } from "./fx";
   import { colorIndexOf as sharedColorIndex, wizardColor } from "./colors";
   import { CREATURE_ART, objectArt, TERRAIN_ART, tokenArt } from "./art";
@@ -215,8 +215,7 @@
     }
     if (!punchFrom) return boxes;
     const beside = (b: { cell: { x: number; y: number }; side: Side }) => {
-      const far = b.side === "E" ? { x: b.cell.x + 1, y: b.cell.y } : b.side === "W" ? { x: b.cell.x - 1, y: b.cell.y }
-        : b.side === "S" ? { x: b.cell.x, y: b.cell.y + 1 } : { x: b.cell.x, y: b.cell.y - 1 };
+      const far = neighbor(b.cell, b.side);
       const at = (c: { x: number; y: number }) => c.x === punchFrom!.x && c.y === punchFrom!.y;
       return at(b.cell) || at(far);
     };