feature: Admin UI for creating and updating RsvpEvent(s)

[sidbhatt11]

[feature: Admin UI for RsvpEvent]

• Adds a basic admin UI (index, creation, updation only for now) for RsvpEvent
• Adds no new DB columns
• Renders RsvpEvent#happens_at in both UTC and user's system/browser time-zone to avoid confusion
• Adds a feature spec for newly added flows
• Closes issues Automate Event RSVP creation #468 Events and Campaigns generations and sending #308

[extra goodies]

• Adds a test helper for "time travelling" (similar to timecop)
  This was necessary because of a validation rule I added on RsvpEvent#happens_at which prevents creating events in the past from the UI. Some tests were using hard-coded timestamps to create RsvpEvent models. This helper allows them to remain frozen in time.
• Added eslint.config.js > ignores because it was trying to lint everything

[screenshots]

[Copilot]

Pull request overview

This PR adds an Admin interface for managing RsvpEvent records (listing, creating, and editing) in the Rails app, including clearer time rendering (UTC + viewer-local) and supporting test infrastructure to keep time-dependent specs stable.

Changes:

• Added Admin::RsvpEventsController, routes, navigation entry, and admin views (index/new/edit + shared form) for RsvpEvent management.
• Updated RsvpEvent to resolve a submitted “wall clock + selected zone” into a stored UTC instant, and added a “not in the past” validation on create.
• Added a time_travel_to: RSpec helper and updated existing specs; added a new feature spec covering the admin flows.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
spec/support/time_travel.rb	Adds time_travel_to: metadata to freeze time in specs via travel_to.
spec/lib/campaigns/event_spec.rb	Pins spec time to avoid date-dependent failures.
spec/helpers/campaigns_helper_spec.rb	Pins spec time to avoid date-dependent failures.
spec/features/admin_event_management_spec.rb	Adds feature coverage for new admin event create/edit flows.
eslint.config.js	Adds ignore globs to prevent linting non-source directories.
config/routes.rb	Exposes admin routes for rsvp_events (index/new/create/edit/update).
app/views/shared/_navigation.html.erb	Adds “Events” link to the committee-only nav.
app/views/admin/rsvp_events/new.html.erb	New-event page wrapper rendering the shared form.
app/views/admin/rsvp_events/index.html.erb	Events listing with UTC + local-time rendering and edit action.
app/views/admin/rsvp_events/edit.html.erb	Edit-event page wrapper rendering the shared form.
app/views/admin/rsvp_events/_form.html.erb	Shared form for create/update (title, happens_at, time zone).
app/models/rsvp_event.rb	Adds time zone resolution logic and new validations/scope behavior.
app/frontend/controllers/local_time_controller.js	Stimulus controller to render viewer-local time from <time datetime="...">.
app/controllers/admin/rsvp_events_controller.rb	CRUD endpoints (index/new/create/edit/update) with strong params and not-found handling.

Comments suppressed due to low confidence (3)

app/views/admin/rsvp_events/_form.html.erb:36

• datetime_select is constrained to start_year: Time.current.year, which can exclude an existing event’s year when editing older events (making the selected value unavailable in the dropdown). Include the event’s year in the selectable range.

    <%= form.datetime_select :happens_at,
                            { selected: event.happens_at&.utc || Time.current.in_time_zone("Australia/Sydney"), start_year: Time.current.year },
                            {

app/views/admin/rsvp_events/_form.html.erb:43

• The time zone dropdown options are limited to country_zones("AU"), but the default is set to "UTC" when editing (event.happens_at.present?). Since "UTC" isn’t in that list, the default/selected value won’t actually be applied.

    <%= form.time_zone_select :time_zone,
                              ActiveSupport::TimeZone.country_zones("AU"),
                              { required: true, default: event.happens_at.present? ? "UTC" : "Sydney" },
                              { class: "px-1 py-0.5 rounded-sm border-gray-300 shadow-sm focus:border-ruby-red focus:ring focus:ring-ruby-red focus:ring-opacity-50 text-sm sm:text-base" } %>

app/views/admin/rsvp_events/index.html.erb:54

• The empty-state row uses colspan="4", but the table only has 3 columns (Title / Happens At / Actions). This can render misaligned table layout in some browsers.

              <td colspan="4" class="px-4 sm:px-6 py-8 text-center text-sm text-gray-500">

[sidbhatt11]

the copilot review is very useful! I will update the PR soon 👍