fix: Workshop share from saved presets + clean load

Share:
- Share modal now shows user's saved presets to pick from
- No longer grabs live canvas (which had serialization issues)
- Auto-fills title from preset name
- Shows module/wire count per preset

Load:
- Stops audio before loading (prevents ghost sounds)
- Deep clones patch data (prevents reference issues)
- Calls deserialize → rebuildGraph → emit in correct order
- Switches to Sandbox after loading

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/client/src/components/Workshop.jsx

@@ -1,9 +1,9 @@
 import React, { useState, useEffect, useCallback } from 'react';
 import { workshop as workshopApi } from '../services/api.js';
 import { useAuth } from '../services/AuthContext.jsx';
-import { state, deserialize } from '../engine/state.js';
-import { serialize } from '../engine/state.js';
-import { rebuildGraph } from '../engine/audioEngine.js';
+import { state, deserialize, emit } from '../engine/state.js';
+import { stopAudio, rebuildGraph } from '../engine/audioEngine.js';
+import { getPresets } from '../engine/presets.js';
 
 const TAGS = ['ambient', 'bass', 'drums', 'pad', 'lead', 'fx', 'chiptune', 'experimental'];
 
@@ -11,17 +11,27 @@ function ShareModal({ onClose, onShared }) {
   const [title, setTitle] = useState('');
   const [description, setDescription] = useState('');
   const [selectedTags, setSelectedTags] = useState([]);
+  const [selectedPreset, setSelectedPreset] = useState(null);
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState('');
 
+  const presets = getPresets();
+
   const handleShare = async () => {
     if (!title.trim()) { setError('Titulo requerido'); return; }
-    if (state.modules.length === 0) { setError('No hay modulos en el canvas'); return; }
+    if (!selectedPreset) { setError('Selecciona un preset para compartir'); return; }
 
     setLoading(true);
     setError('');
     try {
-      const patchData = serialize();
+      // Use the preset data directly (already serialized correctly)
+      const patchData = {
+        modules: selectedPreset.modules || [],
+        connections: selectedPreset.connections || [],
+        camera: selectedPreset.camera || { camX: 0, camY: 0, zoom: 1 },
+        masterVolume: selectedPreset.masterVolume ?? -6,
+      };
+
       await workshopApi.share({
         title: title.trim(),
         description: description.trim(),
@@ -38,10 +48,36 @@ function ShareModal({ onClose, onShared }) {
 
   return (
     <div className="auth-overlay" onClick={onClose}>
-      <div className="auth-card" onClick={e => e.stopPropagation()} style={{ gap: 14 }}>
+      <div className="auth-card" onClick={e => e.stopPropagation()} style={{ gap: 14, maxHeight: '80vh', overflow: 'auto' }}>
         <h2 style={{ fontSize: 18, fontWeight: 700, color: 'var(--text)', margin: 0 }}>Compartir Patch</h2>
 
         <div className="auth-form" style={{ gap: 10 }}>
+          <label className="auth-label">SELECCIONA UN PRESET</label>
+          {presets.length === 0 ? (
+            <p style={{ fontSize: 12, color: 'var(--text2)' }}>
+              No tienes presets guardados. Ve al Sandbox, crea algo y guardalo con "Save" primero.
+            </p>
+          ) : (
+            <div style={{ display: 'flex', flexDirection: 'column', gap: 4, maxHeight: 150, overflowY: 'auto' }}>
+              {presets.map((p, i) => (
+                <button key={i} type="button"
+                  style={{
+                    padding: '10px 12px', background: selectedPreset === p ? 'var(--surface2)' : 'var(--bg)',
+                    border: `1px solid ${selectedPreset === p ? 'var(--accent)' : 'var(--border)'}`,
+                    borderRadius: 6, cursor: 'pointer', textAlign: 'left',
+                    color: 'var(--text)', fontSize: 13, fontFamily: 'inherit',
+                  }}
+                  onClick={() => { setSelectedPreset(p); if (!title) setTitle(p.name || ''); }}
+                >
+                  <strong>{p.name}</strong>
+                  <span style={{ color: 'var(--text2)', fontSize: 11, marginLeft: 8 }}>
+                    {p.modules?.length || 0} modules · {p.connections?.length || 0} wires
+                  </span>
+                </button>
+              ))}
+            </div>
+          )}
+
           <label className="auth-label">TITULO</label>
           <input className="auth-input" placeholder="Nombre de tu patch"
             value={title} onChange={e => setTitle(e.target.value)} />
@@ -65,7 +101,8 @@ function ShareModal({ onClose, onShared }) {
 
           {error && <div className="auth-error">{error}</div>}
 
-          <button className="auth-submit" onClick={handleShare} disabled={loading}>
+          <button className="auth-submit" onClick={handleShare}
+            disabled={loading || presets.length === 0}>
             {loading ? 'Compartiendo...' : 'Compartir'}
           </button>
         </div>
@@ -132,11 +169,18 @@ export default function Workshop({ onSwitchToSandbox, onSwitchToGame }) {
   useEffect(() => { loadPatches(); }, [loadPatches]);
 
   const handleLoad = (patch) => {
-    if (patch.data) {
-      deserialize(patch.data);
-      if (state.isRunning) rebuildGraph();
-      onSwitchToSandbox?.();
-    }
+    if (!patch.data) return;
+
+    // Stop audio, clean state, then load
+    if (state.isRunning) stopAudio();
+
+    // Deep clone to avoid reference issues
+    const cleanData = JSON.parse(JSON.stringify(patch.data));
+    deserialize(cleanData);
+    rebuildGraph();
+    emit();
+
+    onSwitchToSandbox?.();
   };
 
   const handleLike = async (patchId) => {