feat: integrate Microsoft Power Apps SDK and enhance email handling

- Added dependency for @microsoft/power-apps to package.json.
- Updated power.config.json to include appId, environmentId, and connection references.
- Implemented sanitisation function for HTML content in App.tsx to prevent XSS.
- Enhanced error handling in email loading and marking as read functionalities.
- Updated email display logic to handle HTML content and previews.
- Refactored OutlookService to use auto-generated service from @microsoft/power-apps.
- Added new methods for sending, marking as read, and deleting emails in OutlookService.
- Updated types for Email to include bodyPreview, isHtml, hasAttachments, and importance.
- Configured Vite to exclude @microsoft/power-apps/data from the build.
- Created .gitignore to exclude build artifacts and environment files.
- Added local development shim for @microsoft/power-apps/data to support local testing.
- Defined type stubs for @microsoft/power-apps/data to facilitate local development.

vite.config.ts

@@ -7,4 +7,9 @@ export default defineConfig({
     host: true,
     port: 5173,
   },
+  build: {
+    rollupOptions: {
+      external: ['@microsoft/power-apps/data'],
+    },
+  },
 });