Player preferences: art set, auto-grab, flourishes

A ⚙ preferences slip in the masthead, saved to this device:
- Token art, all or nothing: the photographed cardboard or the
  hand-drawn vectors (the workshop's per-category query params stay as
  the undocumented editing override).
- Ending a turn on a lone grabbable treasure picks it up on the way
  out — never on your own home, never when two share the square.
- Spell flourishes on or off, honored by the live board and the
  replay reel alike (trap notices still fire; they are information).
Preferences change what you see or what routine commands the client
sends for you — never what is legal.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0138A8CjeQRpvzKxuMfz1Bqc

packages/web/src/Replay.svelte

@@ -2,6 +2,7 @@
   import Board from "./Board.svelte";
   import { humanize } from "./net.svelte";
   import { scheduleFx, type BoardFx } from "./fx";
+  import { prefs } from "./prefs.svelte";
   import { stackSightTrace } from "@wizwar/engine";
   import type { GameEvent, GameView } from "@wizwar/engine";
 
@@ -30,7 +31,7 @@
   let boardFx = $state<BoardFx[]>([]);
   $effect(() => {
     const step = steps[Math.min(idx, steps.length - 1)];
-    if (!step) return;
+    if (!step || !prefs.flourishes) return;
     const cancel = scheduleFx(
       step.events, step.view,
       (fx) => (boardFx = [...boardFx, fx]),