Release Feature: Telegram Results Delivery

QuickQuiz AI now supports Telegram integration, allowing users to receive scan results directly in Telegram.

Users can connect their Telegram account from the extension settings by tapping Connect Telegram, opening the bot, and pressing Start. Once connected, they can enable Send results to Telegram so quiz analysis results are delivered through the Telegram bot instead of only showing inside the extension.

Included in this release:
- Secure Telegram account linking through bot deep links
- Extension setting to enable or disable Telegram result delivery
- Telegram delivery status in notifications and capture toasts
- Backend support for Telegram webhooks and local polling
- Graceful fallback when Telegram is not connected or delivery fails
- Tests covering linking, webhook handling, and Telegram result formatting