Dedicated "Manage Permissions" modal in the Agent Builder

Managing who can access an AI agent now lives in its own "Manage Permissions" modal, instead of being buried in the agent's Settings tab.

When creating a new agent, a "Manage Permissions" button sits next to Save. When editing an existing agent, "Manage Permissions" is available from the More Actions menu. Permission changes only take effect after clicking Apply, so it's easier to review and discard edits before they go live.