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/prefs.svelte.ts

@@ -0,0 +1,41 @@
+// Player preferences: purely client-side taste, saved on this device.
+// Nothing here touches the rules — a preference may change what you SEE
+// or what routine commands the client sends on your behalf, never what
+// is legal.
+
+export interface Prefs {
+  /** Token art: the photographed cardboard, or the hand-drawn vectors. */
+  art: "photo" | "drawn";
+  /** Standing on lone grabbable gold at end of turn: pick it up first. */
+  autoGrab: boolean;
+  /** Spell flourishes (the animated effects layer). */
+  flourishes: boolean;
+}
+
+const KEY = "wizwar-prefs";
+
+function load(): Prefs {
+  const fallback: Prefs = { art: "photo", autoGrab: false, flourishes: true };
+  try {
+    const raw = localStorage.getItem(KEY);
+    if (!raw) return fallback;
+    const p = JSON.parse(raw) as Partial<Prefs>;
+    return {
+      art: p.art === "drawn" ? "drawn" : "photo",
+      autoGrab: p.autoGrab === true,
+      flourishes: p.flourishes !== false,
+    };
+  } catch {
+    return fallback;
+  }
+}
+
+export const prefs = $state<Prefs>(load());
+
+export function savePrefs(): void {
+  try {
+    localStorage.setItem(KEY, JSON.stringify(prefs));
+  } catch {
+    // A full or blocked localStorage loses persistence, not the session.
+  }
+}