feat: Add major features - Mejoras 5-10

- Mejora 5: Órdenes de Compra integration in obra detail
- Mejora 6: Portal de Cliente with JWT auth for clients
- Mejora 7: Diagrama de Gantt for project visualization
- Mejora 8: Push Notifications with service worker
- Mejora 9: Activity Log system with templates
- Mejora 10: PWA support with offline capabilities

New features include:
- Fotos gallery with upload/delete
- Bitácora de obra with daily logs
- PDF export for reports, gastos, presupuestos
- Control de asistencia for employees
- Client portal with granular permissions
- Gantt chart with task visualization
- Push notification system
- Activity timeline component
- PWA manifest, icons, and install prompt

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/generate-icons.js

@@ -0,0 +1,56 @@
+const fs = require('fs');
+const path = require('path');
+
+// Read the SVG file
+const svgPath = path.join(__dirname, '../public/icons/icon.svg');
+const svgContent = fs.readFileSync(svgPath, 'utf8');
+
+// Icon sizes for PWA
+const sizes = [72, 96, 128, 144, 152, 192, 384, 512];
+
+// Try to use sharp if available, otherwise create placeholder files
+async function generateIcons() {
+  try {
+    const sharp = require('sharp');
+
+    for (const size of sizes) {
+      const outputPath = path.join(__dirname, `../public/icons/icon-${size}x${size}.png`);
+
+      await sharp(Buffer.from(svgContent))
+        .resize(size, size)
+        .png()
+        .toFile(outputPath);
+
+      console.log(`Generated: icon-${size}x${size}.png`);
+    }
+
+    // Generate favicon
+    await sharp(Buffer.from(svgContent))
+      .resize(32, 32)
+      .png()
+      .toFile(path.join(__dirname, '../public/favicon.png'));
+
+    console.log('Generated: favicon.png');
+
+    // Generate apple-touch-icon
+    await sharp(Buffer.from(svgContent))
+      .resize(180, 180)
+      .png()
+      .toFile(path.join(__dirname, '../public/apple-touch-icon.png'));
+
+    console.log('Generated: apple-touch-icon.png');
+
+    console.log('\nAll icons generated successfully!');
+  } catch (error) {
+    if (error.code === 'MODULE_NOT_FOUND') {
+      console.log('Sharp not found. Installing...');
+      const { execSync } = require('child_process');
+      execSync('npm install sharp --save-dev', { stdio: 'inherit' });
+      console.log('Sharp installed. Please run this script again.');
+    } else {
+      console.error('Error generating icons:', error);
+    }
+  }
+}
+
+generateIcons();