Learnings

Feature: Implemented tag filtering

Action: I implemented the tag filtering feature.
Details: I added a tag_list helper to the Learning model (simple tags.split(',').map(&:strip)). I updated LearningsController#index to filter by params[:tag] (where("tags LIKE ?", "%#{params[:tag]}%")) and collect unique tags for the view (Learning.pluck(:tags).flat_map { |t| t.split(',') }.uniq). I updated index.html.erb with a turbo_frame_tag around the list, clickable tag links (link_to tag, learnings_path(tag: tag)), and filter controls. I added basic CSS styling for tags.
Learning: I learned that simple string-based tags (comma-separated) can be made functional for filtering using basic Rails querying (LIKE or string_to_array in PG) and Turbo Frames for efficient UI updates without full page reloads, adhering to the 37signals principle of starting simple.