# Changelog ## [Unreleased] ### Added - **Cartes report**: help tooltip on the savings-rate KPI explaining the formula — `(income − expenses) ÷ income × 100`, computed on the reference month (#101) - **Trends report — by category** (`/reports/trends`): new segmented toggle to switch the category-evolution chart between stacked bars (default, unchanged) and a Recharts stacked-area view (``) that shows total composition over time. Both modes share the same category palette and SVG grayscale patterns. The chosen type is persisted in `localStorage` (`reports-trends-category-charttype`) (#105) ### Changed - **Category zoom report** (`/reports/category`): the category picker is now a typeable, searchable combobox with accent-insensitive matching, keyboard navigation (↑/↓/Enter/Esc) and hierarchy indentation, replacing the native `