## Summary
Transfer categories with `cashflow_direction` set to `outflow` or
`inflow` now appear in the **Sankey diagram** instead of the 12-month
trend chart. This gives a clearer picture of money flow (e.g.
investments, savings transfers) without inflating the income/expense
trend lines. Hidden transfers remain excluded from everything.
## Changes
- **Sankey endpoint**: Updated join to include tracked transfer
categories on the matching flow side (outflow → expense side, inflow →
income side)
- **Trend endpoint**: Removed `transfer_inflow` and `transfer_outflow`
columns from the SQL query and API response
- **Trend chart UI**: Removed tracked inflow/outflow bars, tooltip rows,
legend items, and related config
- **TypeScript types**: Removed `transfer_inflow`/`transfer_outflow`
from `TrendDataPoint`
- **Category form**: Updated direction field description to reference
"Sankey chart" instead of "monthly trend"
- **Tests**: Updated 4 existing tests and added 2 new tests covering
tracked transfers in Sankey breakdown
## Design decision
Tracked transfers appear **only in the Sankey diagram** — they do not
affect summary totals, savings rate, or breakdown cards. This keeps the
high-level numbers accurate while still visualizing where money flows
internally.
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