refactor(feedback): replace jSimple Star Rating with progressive Font Awesome stars

[mroderick]

What

Removes the abandoned jSimple Star Rating jQuery plugin and replaces it with a small vanilla-JS initializer that progressively enhances radio buttons into CSS-generated Unicode stars.

Why

jSimple Star Rating is unmaintained and was the only consumer of a hand-vendored, unversioned minified file. The new implementation is dependency-free, accessible, and works without JavaScript.

Font Awesome was not used for the stars because the project loads Font Awesome 5 with SVG+JS, which replaces <i> elements at runtime. Toggling far/fas classes on those tags after replacement has no visual effect, so the stars are rendered via CSS ::before content instead.

Changes

• Add app/assets/javascripts/feedback-rating.js (vanilla JS initializer)
• Replace f.hidden_field :rating with radio buttons in app/views/feedback/show.html.haml
• Update app/assets/stylesheets/partials/_star-rating.scss to use CSS ::before star glyphs
• Delete app/assets/javascripts/jsimple-star-rating.min.js
• Delete app/assets/images/star-rating.gif
• Update spec/features/member_feedback_spec.rb to click the star label and assert the persisted rating
• Remove the inline :javascript block from the feedback view
• Include the updated implementation plan under docs/plans/

Automated verification

• bundle exec rubocop spec/features/member_feedback_spec.rb — clean
• bundle exec haml-lint app/views/feedback/show.html.haml — clean
• bundle exec rails runner 'puts "boot OK"' — boots
• bundle exec rspec spec/controllers/feedback_controller_spec.rb spec/models/feedback_spec.rb — 11 examples, 0 failures
• bundle exec rspec spec/features/member_feedback_spec.rb — 9 examples, 0 failures
• RAILS_ENV=test bundle exec rails assets:precompile — succeeds
• Browser snapshot: clicking the 4th star fills stars 1–4

Manual verification

1. Start the server:

   bundle exec rails server

2. In another terminal, open a Rails console and create a feedback request:

   member = Member.first
   workshop = Workshop.first
   coach = Member.where.not(id: member.id).first
   
   WorkshopInvitation.find_or_create_by!(workshop: workshop, member: coach, role: 'Coach') do |invitation|
     invitation.attending = true
     invitation.attended = true
   end
   
   Tutorial.first || Tutorial.create!(title: 'Test tutorial', url: 'http://example.com')
   
   fr = FeedbackRequest.create_with(submited: false).find_or_create_by!(member: member, workshop: workshop)
   puts "http://localhost:3000/feedback/#{fr.token}"

3. Open the printed URL in a browser.

4. Click stars — they should fill; click the same star again to clear; hover previews.

5. Select a coach and tutorial, then submit. You should be redirected to the homepage with "Thank you for your feedback".

6. Check that the rating was persisted:

   Feedback.find_by(workshop: workshop, coach: coach, tutorial: Tutorial.first).rating

7. To test progressive enhancement, disable JavaScript in devtools and reload: the radio buttons should still let you pick a rating and submit.