- Removed legacy Outlook integration, including views, controllers, and models.
- Introduced Microsoft Entra ID OAuth flows with enhanced permission checks and token management.
- Migrated database structure: replaced `outlook_tokens` table with `oauth_tokens` table for multi-provider support.
- Added comprehensive tests for Entra ID federation, including connection flow, token refresh, and permission checks.
- Standardized OAuth implementation using `EntraController` and consolidated token models into `OauthToken`.
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