Feature: Upgrade Tailwind to v4 and other gems

.cursor/rules/rails.mdc

@@ -22,6 +22,8 @@ e.g use `rails generate model` instead of creating a model from scratch
 - Monitor development.log for errors and performance issues
 - Use `tail -f log/development.log` for real-time monitoring
 - Review logs before considering any change complete
+- Use modern Ruby 3.4 and Rails 8.1 syntax
+- Avoid using deprecated patterns, like OpenStruct
 
 1. **Modern Infrastructure**
    - Use Thruster for asset compression and caching

.ruby-version

@@ -1 +1 @@
-3.3.7
+3.4.4

Gemfile

@@ -6,7 +6,7 @@ gem "rails", github: "rails/rails", branch: "main"
 gem "propshaft"
 # Use sqlite3 as the database for Active Record
 gem "sqlite3", ">= 2.1"
-gem 'sqlite-ulid'
+gem "sqlite-ulid"
 # Use the Puma web server [https://github.com/puma/puma]
 gem "puma", ">= 5.0"
 # Use JavaScript with ESM import maps [https://github.com/rails/importmap-rails]
@@ -16,16 +16,13 @@ gem "turbo-rails"
 # Hotwire's modest JavaScript framework [https://stimulus.hotwired.dev]
 gem "stimulus-rails"
 # Use Tailwind CSS [https://github.com/rails/tailwindcss-rails]
-gem "tailwindcss-rails"
+gem "tailwindcss-rails", "~> 4.0"
 # Build JSON APIs with ease [https://github.com/rails/jbuilder]
 gem "jbuilder"
 
 # Use Active Model has_secure_password [https://guides.rubyonrails.org/active_model_basics.html#securepassword]
 # gem "bcrypt", "~> 3.1.7"
 
-# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
-gem "tzinfo-data", platforms: %i[ windows jruby ]
-
 # Use the database-backed adapters for Rails.cache, Active Job, and Action Cable
 gem "solid_cache"
 gem "solid_queue"
@@ -53,7 +50,7 @@ group :development, :test do
   # Omakase Ruby styling [https://github.com/rails/rubocop-rails-omakase/]
   gem "rubocop-rails-omakase", require: false
 
-  gem 'dotenv'
+  gem "dotenv"
 end
 
 group :development do