Turn Market Data into a Historical View

The application now has its core workflows. The final module adds the historical rate series, the Canvas chart, range switching, responsive redraw behavior, and a full end-to-end validation pass.

What you will build

• range-to-day mapping
• historical data loading from Frankfurter
• Canvas drawing from actual returned points
• chart resizing and startup flow
• final responsive and workflow testing

Checkpoint

Changing the chart range fetches the corresponding historical window, the chart redraws correctly, and the complete app still works on desktop and narrow screens.