fix grouping functionality

scripts/build-windows.ps1

@@ -38,6 +38,10 @@ $pythonExe = if (Test-Path ".\.venv\Scripts\python.exe") {
 $frontendDist = Join-Path $repoRoot "frontend\dist"
 $demoDir = Join-Path $repoRoot "demo"
 
+Write-Host "Removing cached frontend and desktop build artifacts..."
+node scripts\clean-build-artifacts.mjs --mode=native
+Assert-LastExitCode "Artifact cleanup"
+
 Write-Host "Building frontend bundle..."
 npm run build
 Assert-LastExitCode "Frontend build"

scripts/clean-build-artifacts.mjs

@@ -0,0 +1,70 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const scriptDir = path.dirname(fileURLToPath(import.meta.url));
+const repoRoot = path.resolve(scriptDir, '..');
+const args = new Set(process.argv.slice(2));
+const mode = args.has('--mode=native') || args.has('--native') ? 'native' : 'frontend';
+
+const removed = [];
+
+function removePath(targetPath) {
+  if (!fs.existsSync(targetPath)) return;
+  fs.rmSync(targetPath, { recursive: true, force: true });
+  removed.push(path.relative(repoRoot, targetPath) || '.');
+}
+
+function removePythonCaches(rootPath) {
+  const stack = [rootPath];
+  const skipDirs = new Set(['.git', '.venv', 'node_modules']);
+
+  while (stack.length > 0) {
+    const current = stack.pop();
+    let entries = [];
+
+    try {
+      entries = fs.readdirSync(current, { withFileTypes: true });
+    } catch {
+      continue;
+    }
+
+    for (const entry of entries) {
+      const fullPath = path.join(current, entry.name);
+
+      if (entry.isDirectory()) {
+        if (entry.name === '__pycache__') {
+          removePath(fullPath);
+          continue;
+        }
+        if (skipDirs.has(entry.name)) continue;
+        stack.push(fullPath);
+        continue;
+      }
+
+      if (entry.isFile() && (entry.name.endsWith('.pyc') || entry.name.endsWith('.pyo'))) {
+        try {
+          fs.rmSync(fullPath, { force: true });
+          removed.push(path.relative(repoRoot, fullPath) || '.');
+        } catch {
+          // Ignore files held open by another process; the rest of the clean can still continue.
+        }
+      }
+    }
+  }
+}
+
+removePath(path.join(repoRoot, 'frontend', 'dist'));
+removePath(path.join(repoRoot, 'frontend', 'node_modules', '.vite'));
+removePythonCaches(repoRoot);
+
+if (mode === 'native') {
+  removePath(path.join(repoRoot, 'desktop-build'));
+  removePath(path.join(repoRoot, 'desktop-dist'));
+}
+
+if (removed.length === 0) {
+  console.log(`[clean] No cached build artifacts found (${mode}).`);
+} else {
+  console.log(`[clean] Removed ${removed.length} artifact${removed.length === 1 ? '' : 's'} (${mode}).`);
+}