Enhances dashboard with new metrics and charts

Improves the dashboard with additional metrics and visualizations
to provide a more comprehensive overview of application usage and performance.

Adds new charts, including:
- Word cloud for category analysis
- Geographic map for user distribution (simulated data)
- Response time distribution chart

Refactors existing components for improved clarity and reusability,
including the introduction of a generic `MetricCard` component.

Improves error handling and user feedback during data refresh and
session loading.

Adds recommended VSCode extensions for ESLint and Prettier.

lib/sendEmail.ts

@@ -1,8 +1,8 @@
 export async function sendEmail(
   to: string,
   subject: string,
-  text: string,
+  text: string
 ): Promise<void> {
   // For demo: log to console. Use nodemailer/sendgrid/whatever in prod.
-  console.log(`[Email to ${to}]: ${subject}\n${text}`);
+  process.stdout.write(`[Email to ${to}]: ${subject}\n${text}\n`);
 }