## Summary
A credit card is a spending account, not wealth. This change:
- **Excludes credit cards from net worth entirely** — they no longer add
to *or* subtract from the net worth total, the evolution chart, or its
trends. They are filtered out at the source, so every net-worth
aggregation (backend summary + frontend chart/trend/MoM) is consistent.
- **Shows the credit card balance as a positive figure** on the
per-account cards, on both the dashboard and the Accounts page (like any
other account).
- **Fixes a loan sign inconsistency**: a loan used to show *positive* on
the Accounts page but *negative* on the dashboard. The Accounts list now
applies the liability sign too, so loans render negative in both places.
### Why
A user reported that a credit card showed as a positive balance on the
Accounts screen but dragged their net worth down on the dashboard — the
same account rendered with opposite signs on the two screens. The root
cause was that credit cards were modelled as liabilities (like loans)
and each screen computed the balance through a different path. Product
decision: a credit card is spendable credit, so its balance is shown
as-is and simply doesn't participate in net worth.
## Behavior
| Account (e.g. 90k / 50k) | Per-account cards (dashboard + Accounts) |
Net worth chart & total |
| --- | --- | --- |
| **Credit card** | `+90,000` | **excluded** (not counted) |
| **Loan** | `−50,000` (was `+50,000` on Accounts) | subtracts
(unchanged) |
| Checking / savings / … | unchanged | unchanged (asset) |
## ⚠️ Existing-data impact
Previously credit cards were forced to **reduce** net worth
(`-abs(balance)`). With this change they are excluded, so **users with
existing credit-card accounts will see their net worth rise** by
whatever their cards used to subtract. This is a deliberate semantic
change, not a migration — no stored balances are altered.
## Implementation
- `AccountType::countsInNetWorth()` — new predicate, `false` only for
credit cards; `calculateNetWorthAt()` skips excluded types.
- `AccountType::reducesNetWorth()` / `LIABILITY_TYPES` — now only
`loan`, so `netWorthContribution()` renders credit cards positive on the
per-account cards.
- `net-worth-chart.tsx` — credit cards filtered out of
`includedAccounts` (one point that cascades to segments, totals, trends
and `useChartViews`).
- `Accounts/Index.tsx` — applies `netWorthContribution()` so loans
render negative, matching the dashboard.
## Testing
- Backend: `AccountTypeTest` (32) and `DashboardAnalyticsTest` (credit
card excluded, loan still subtracts) — green.
- Frontend: `chart-calculations.test.ts` (37) — green.
- `pint`, `prettier`, `eslint` — clean.
Browser QA skipped per request (the logged-in flow is also currently
blocked locally by pending Spaces migrations). Logic is fully covered by
the tests above.
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