- Add CommunityInvitationNotifier for handling notifications via ActionCable and email.
- Create CommunityInvitationPolicy to manage permissions for creating, destroying, and resending invitations.
- Enhance CommunityPolicy to allow access based on invitation status and tokens.
- Develop views for invitation review, including actions to accept or decline invitations.
- Introduce invitations panel for inviting members via email or existing users.
- Create invitations table to display current invitations with status and actions.
- Update routes to include nested resources for community invitations.
- Add factories and specs for CommunityInvitation model and its functionalities.
- Implement tests for invitation review and token access scenarios.
- Add internationalization support for invitation-related strings in multiple languages.

- Introduced `InvitationTokenAuthorization` concern to manage invitation token extraction and validation.
- Added `InvitationTokenSession` concern for session management of invitation tokens.
- Created `InvitationUserSetup` concern for user setup from invitation data, including email pre-filling and person assignment.
- Established `InvitationMailerBase` for shared functionality in community and event invitation mailers.
- Updated `CommunityInvitationsMailer` and `EventInvitationsMailer` to inherit from `InvitationMailerBase`.
- Created `InvitationNotifierBase` for common notification functionality across invitation types.
- Refactored `CommunityInvitationPolicy` and `EventInvitationPolicy` to inherit from a new `InvitationPolicy` base class.
- Simplified community and event invitation models by removing unnecessary status handling and validation logic.
- Updated tests to reflect changes in invitation handling and authorization logic.

…t invitations

- Added shared partials for invitation review, invitation panel, and invitations table to reduce code duplication.
- Updated community and event show views to utilize new shared components.
- Enhanced role selection field in invitation forms.
- Removed outdated invitation-related views.
- Updated localization keys for consistency across languages.

…itations

- Implemented `CommunityInvitationPolicy` and `EventInvitationPolicy` with tests for resend, create, and destroy actions.
- Created request specs for basic invitation creation, duplicate invitation prevention, and invitation error handling.
- Added system tests for declined invitation resending and UI interactions for invitation resending.
- Developed view specs for rendering invitation rows with appropriate buttons based on invitation status.
- Enhanced user registration flow with invitation handling for community, event, and platform invitations.

Fixes LoadError in GitHub Actions by using the engine's root path
instead of relative path which fails in CI environment.

This resolves the error:
cannot load such file -- /home/runner/work/community-engine-rails/lib/generators/better_together/invitation/invitation_generator

…oved functionality and clarity

- Added support for custom namespaces in the invitation generator, allowing users to specify a namespace when generating models, mailers, policies, and factories.
- Updated the generator to handle both engine and host app contexts, defaulting to the appropriate namespace based on the context.
- Introduced a `--with-migration` option to generate a separate migration for invitations, with appropriate warnings and instructions for users.
- Refactored file paths and class names to accommodate namespacing, ensuring generated files are correctly placed in the specified namespace.
- Updated templates for models, mailers, policies, and factories to reflect the new namespacing logic.
- Added comprehensive tests to verify the correct behavior of the generator with various namespace configurations, including custom namespaces and empty namespaces.