* feat: add notifications schema
* chore: gen migration
* feat: add mention email template
* feat: add sendMentionEmail func
* feat: add repo funcs
* feat: update card router to send emails on mention
* fix: update the editor suggestion to show all members
* feat: skip pending members in sendMentionEmails
* feat: update comments to use tiptap editor
* refactor: replace presigned URL uploads with backend upload endpoints
* feat: update avatar upload to use new endpoint
* refactor: use createS3Client in auth hooks
* feat: generate presigned URLs for avatars
* fix: show avatar image in user menu
* fix: hide tooltip if content is empty
* fix: support external avatar URLs in generateAvatarUrl
* fix: remove content type restriction on attachments