Organization members, invites, and resend flow

Organization member management has been overhauled to cover the full lifecycle of an invite.

• The MembersList component accepts an initial members payload so it renders instantly and revalidates in the background.
• A new AddMember component lets you invite by email, choose a role, and select target workspaces in one form.
• Pending invites can be resent or revoked from a per-row menu without re-typing the email.
• Transfer-ownership flow handles edge cases like inviting an existing user, the inviter losing access immediately, and orgs that have only one remaining owner.
• The role/permission picker now uses the updated multi-select dropdown that supports the larger role catalog without overflowing.

Invite emails route through the dashboard’s OAuth handlers so social-login users can accept invitations and activate the right organization without an extra signup.