v1.2.1

This release brings the extension in line with the new Gavaller backend ecosystem. Authentication is now handled through the central gateway, enabling persistent, account-synced alerts that survive reinstalls and work across Chrome, Firefox, and Edge simultaneously.

Key changes:
• Price alerts are now saved to your account — not just the browser
• Alert status syncs across all open Tesco tabs in real time
• New account switcher — change accounts without a full sign-out
• Language toggle (EN/HU) added directly in the popup header
• Dark/light theme toggle with persistent preference
• Active alert count badge on the toolbar icon
• Product names cached locally for instant popup load
• Fixed 405 errors on alert creation and deletion
• Cleaner popup layout with version badge and improved header

Better history management.
Major bug fixes.