Added some new visuals for BYB

Added a better way to visualize where money is actually going (vs just a list of transactions).

New visuals include:

Cash Flow View: A Sankey diagram that connects your income sources directly to your expenses categories so you can see the flow.
Spending Distribution: A breakdown of top categories and percentages (groceries is killing me this month...).
Daily Trends: A simple line graph to spot spending spikes throughout the month.

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