[Bug Fix] Install tw-animate-css for importmap

[djalmaaraujo]

Summary

• Special-case tw-animate-css for Importmap installs by downloading the CSS asset directly
• Update the Tailwind importmap template to import the downloaded .css file
• Add coverage for the Importmap CSS asset path

Closes #317

Testing

• docker run --rm -v ruby_ui_bundle:/usr/local/bundle -v /Users/djalmaaraujo/dev/linkana/ruby_ui-issue-317:/workspace -w /workspace/gem ruby:3.4.7 bash -lc 'bundle install && bundle exec ruby -Itest test/generators/javascript_utils_test.rb'
• docker run --rm -v ruby_ui_bundle:/usr/local/bundle -v /Users/djalmaaraujo/dev/linkana/ruby_ui-issue-317:/workspace -w /workspace/gem ruby:3.4.7 bash -lc 'bundle install && bundle exec standardrb lib/generators/ruby_ui/javascript_utils.rb test/generators/javascript_utils_test.rb'