Flujo 6.2. Statistics, backup, and custom categories.

Statistics dashboard. The resumen tab now shows six stat cards: total
spent across all time, comparison vs last month (with up/down arrows and
percentage), daily average for the current month, the most expensive day
of the month, number of entries this month, and average per entry. The
cards update automatically when you add or remove expenses.

Backup. You can export all your data to CSV (for spreadsheets) or JSON
(for a full backup that includes expenses, income, people, debts,
budgets, and goals). You can also import a JSON file to restore
everything. Useful for moving your data to another browser or just
keeping a safe copy.

Custom categories. You can now create your own expense categories with
a custom name and a custom color using a color picker. The new
categories appear automatically in the expense form and the ticket
scanner. The charts and Sankey diagram will use your custom colors.