Windows support: cross-built NSIS installer

- toFileURL and path-basename handling made Windows-safe (backslashes,
  drive letters) so media/model loading works there
- Blender discovery scans Program Files\Blender Foundation; ffmpeg
  candidates include common Windows paths
- build config: win/nsis target (x64, custom install dir), build/icon.ico
  generated from the 1024 png, dist:win script
Cross-compiled from macOS: dist/DJ Visualizer Setup 1.6.0.exe (95MB) with
scripts unpacked and models/MediaPipe bundled. Untested on real Windows.

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

main.js

@@ -114,6 +114,15 @@ async function ensureMicAccess() {
 function blenderPath() {
   const cands = ['/Applications/Blender.app/Contents/MacOS/Blender',
     '/opt/homebrew/bin/blender', '/usr/local/bin/blender'];
+  if (process.platform === 'win32') {
+    // Blender installs versioned folders under Program Files
+    for (const root of ['C:\\Program Files\\Blender Foundation', 'C:\\Program Files (x86)\\Blender Foundation']) {
+      try {
+        for (const d of fs.readdirSync(root))
+          cands.push(path.join(root, d, 'blender.exe'));
+      } catch (e) { /* root missing */ }
+    }
+  }
   for (const c of cands) if (fs.existsSync(c)) return c;
   return null;
 }
@@ -209,7 +218,8 @@ function ffmpegPath() {
   const cands = [];
   try { cands.push(require('ffmpeg-static')); } catch (e) { /* optional */ }
   cands.push(process.env.FFMPEG, 'ffmpeg',
-    '/opt/homebrew/bin/ffmpeg', '/usr/local/bin/ffmpeg', '/usr/bin/ffmpeg');
+    '/opt/homebrew/bin/ffmpeg', '/usr/local/bin/ffmpeg', '/usr/bin/ffmpeg',
+    'C:\\ffmpeg\\bin\\ffmpeg.exe', 'C:\\Program Files\\ffmpeg\\bin\\ffmpeg.exe');
   for (const c of cands) {
     if (!c) continue;
     if (c === 'ffmpeg' || fs.existsSync(c)) return c;

package.json

@@ -10,7 +10,8 @@
   "license": "MIT",
   "scripts": {
     "start": "electron .",
-    "dist": "electron-builder --mac"
+    "dist": "electron-builder --mac",
+    "dist:win": "electron-builder --win"
   },
   "build": {
     "appId": "com.djvisualizer.app",
@@ -22,6 +23,21 @@
       "icon": "build/icon.icns",
       "identity": null
     },
+    "win": {
+      "target": [
+        {
+          "target": "nsis",
+          "arch": [
+            "x64"
+          ]
+        }
+      ],
+      "icon": "build/icon.ico"
+    },
+    "nsis": {
+      "oneClick": false,
+      "allowToChangeInstallationDirectory": true
+    },
     "files": [
       "main.js",
       "preload.js",

src/control.js

@@ -250,8 +250,8 @@ function glbLabel(name) {
     : 'Il modello ruota a tempo di musica nella famiglia “Modello 3D”.';
 }
 if (glbPath) {
-  glbLabel(glbPath.split('/').pop());
+  glbLabel(glbPath.split(/[\\/]/).pop());
-  if (!glbModels.some(m => m.path === glbPath)) addGlbModel(glbPath.split('/').pop(), glbPath);
+  if (!glbModels.some(m => m.path === glbPath)) addGlbModel(glbPath.split(/[\\/]/).pop(), glbPath);
 }
 renderGlbModels();
 // every shader family can be a backdrop too (fluid/interactive/3D excluded:
@@ -292,7 +292,7 @@ $('#anim-input').addEventListener('change', async (e) => {
       if (res && res.ok) {
         if (!glbAnimFiles.includes(res.path)) glbAnimFiles.push(res.path);
         send({ type: 'animAdd', path: res.path });
-        glbLabel(glbPath ? glbPath.split('/').pop() : '');
+        glbLabel(glbPath ? glbPath.split(/[\\/]/).pop() : '');
       } else {
         $('#glb-name').textContent = '⚠️ ' + ((res && res.error) || 'conversione fallita');
       }
@@ -784,7 +784,7 @@ function refreshScenePreview(i) {
   advanceCues(playCur || 0);
 }
 
-const baseName = (p) => p.split('/').pop();
+const baseName = (p) => p.split(/[\\/]/).pop();
 
 function probePaths(paths) {
   const todo = paths.filter(p => p && !(p in durations));

src/output.js

@@ -17,9 +17,12 @@ try {
 const audio = new AudioEngine();
 let speed = 1.0;
 
-// Convert an absolute filesystem path into a file:// URL the renderer can load.
+// Convert an absolute filesystem path into a file:// URL the renderer can
+// load (Windows: backslashes -> slashes, drive letter needs a leading /).
 function toFileURL(p) {
-  return encodeURI('file://' + p).replace(/#/g, '%23').replace(/\?/g, '%3F');
+  let n = String(p).replace(/\\/g, '/');
+  if (n[0] !== '/') n = '/' + n;
+  return encodeURI('file://' + n).replace(/#/g, '%23').replace(/\?/g, '%3F');
 }
 
 // ---------------------------------------------------------------- overlays
@@ -341,7 +344,7 @@ djv.onControl(async (m) => {
         const buf = bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.byteLength);
         const ok = viz.setModelData(buf);
         if (ok === false) throw new Error((viz.model3d && viz.model3d.loadError) || 'GLB non valido');
-        djv.report({ type: 'glbLoaded', name: m.path.split('/').pop() });
+        djv.report({ type: 'glbLoaded', name: m.path.split(/[\\/]/).pop() });
         reportClips();
         hideHint();
       } catch (e) { djv.report({ type: 'error', message: 'GLB: ' + e.message }); }