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.

.prettierrc.json

@@ -0,0 +1,10 @@
+{
+  "singleQuote": false,
+  "trailingComma": "es5",
+  "semi": true,
+  "tabWidth": 2,
+  "useTabs": false,
+  "printWidth": 80,
+  "bracketSpacing": true,
+  "endOfLine": "auto"
+}