Implement a forecast chart that visualizes the projected learning progress over time. The chart should include a timeline starting from a week ago, showing the current state and predicting future outcomes. It should display three key states: Initiated, Practiced, and Memorized, each represented by a distinct color. The chart helps users understand their learning trajectory by highlighting the progress they've made and providing insight into what they can expect in the upcoming week. Tooltips or information icons can be added to provide further clarification on the meaning of each state and the data represented.