Every flourish gets its own file, and a workshop to watch them in

The effects move out of Board.svelte into src/fx-sprites/ — one
component per flourish, markup and animation CSS together, so editing
the fireball means opening Fireball.svelte and nothing else. A
registry (index.ts) maps kind to sprite; Board renders through it.
The event mapping stays in fx.ts.

And a viewer: /?fx opens the Flourish Workshop — every sprite on a
labeled parchment tile, replaying on a 2.2-second beat. Under the dev
server, editing any sprite file hot-reloads the gallery mid-loop.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/web/src/fx-sprites/Shield.svelte

@@ -0,0 +1,26 @@
+<script lang="ts">
+  import type { FxOf } from "../fx";
+  import { center } from "./geom";
+  let { fx }: { fx: FxOf<"shield"> } = $props();
+  const c = $derived(center(fx.at));
+</script>
+
+<circle cx={c.x} cy={c.y} r="16" class="shield" />
+
+<style>
+  .shield {
+    transform-box: fill-box;
+    transform-origin: center;
+    fill: none;
+    stroke: #c9a72a;
+    stroke-width: 3.5;
+    filter: drop-shadow(0 0 6px rgba(201, 167, 42, 0.8));
+    animation: pulse 0.7s ease-out forwards;
+  }
+  @keyframes pulse {
+    0% { opacity: 0; transform: scale(0.6); }
+    30% { opacity: 1; transform: scale(1.1); }
+    60% { transform: scale(0.95); }
+    100% { opacity: 0; transform: scale(1.15); }
+  }
+</style>