Closes#47854
Move `disable_ai` from root settings to `ProjectSettingsContent` to
enable per-project AI configuration via `.zed/settings.json`.
- Update settings UI to allow viewing/editing at both user and project
level
- Update editor to check project-level settings for edit predictions and
context menus
- Prevent MCP servers from starting when AI is disabled at project level
Note: SaturatingBool ensures that if user globally disables AI, projects
cannot re-enable it. Projects can only further restrict AI, not grant
it.
Release Notes:
- added support for disabling AI in project settings
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Co-authored-by: Ben Kunkle <ben.kunkle@gmail.com>
