Add html classes and body classes helpers to ApplicationHelper

Add html classes and body classes helpers to ApplicationHelper: a task in bird-critic-1.5-full-300 (Harbor dataset). The Mastodon codebase is at /workspace/repo . This is a Ruby on Rails federated social media application. Services (Redis, PostgreSQL) are already running. Dependencies are…

The task

The Mastodon codebase is at `/workspace/repo`. This is a Ruby on Rails federated social media application. Services (Redis, PostgreSQL) are already running. Dependencies are pre-installed.

Part of kochsnow/bird-critic-1.5-full-300.