clear hydra in mini repl

website/src/docs/MiniRepl.jsx

@@ -1,6 +1,7 @@
 import { useState, useRef, useCallback, useMemo, useEffect } from 'react';
 import { Icon } from './Icon';
 import { silence, noteToMidi, _mod } from '@strudel/core';
+import { clearHydra } from '@strudel/hydra';
 import { getDrawContext, getPunchcardPainter } from '@strudel/draw';
 import { transpiler } from '@strudel/transpiler';
 import { getAudioContext, webaudioOutput, initAudioOnFirstClick } from '@strudel/webaudio';
@@ -78,6 +79,11 @@ export function MiniRepl({
       onUpdateState: (state) => {
         setReplState({ ...state });
       },
+      onToggle: (playing) => {
+        if (!playing) {
+          clearHydra();
+        }
+      },
       beforeStart: () => audioReady,
       afterEval: ({ code }) => setVersionDefaultsFrom(code),
     });