## What
Reworks the filtered **transaction analysis drawer** to behave like a
*project view* — a coherent set of related transactions (a trip, a
rental, a renovation, a side hustle) — and surfaces data that was
already computable but never shown.
### Two shapes, auto-detected
The drawer adapts to whether the set is **expense-only** or **income +
expense**, detected from the income share (`income >= 15% of expense`).
A stray refund won't flip a trip into a P&L view; a rental's rent will.
- **Expense mode:** total spent, daily average, cumulative spend line.
- **Income mode:** net result + margin %, income vs expense bars,
cumulative **net** line.
The mode can be overridden per filter (Auto / Expenses only / Income &
expenses), mirroring the existing daily-average override exactly:
remembered in the browser per filter fingerprint and synced to a
matching saved filter via a new `analysis_mode` column + PATCH endpoint.
### New panels (all from existing data)
- **Largest expenses** — top 5, expandable to 10, biggest spends first.
- **Spending by payee** — horizontal bars, gated to ≥2 named payees.
- **Spending by account** — list, gated to ≥2 accounts.
### Smarter table
The largest-expenses table hides any column the filter or the rows have
pinned to a single value (e.g. filtering by one label drops the Labels
column; a one-category result drops the Category column).
## Tests
- **Backend:** new Pest coverage for `largest_expenses`, payee/account
breakdowns, `cumulative_net`, and the `analysis_mode` endpoint
(`TransactionAnalysisTest`, `SavedFilterTest`) — all green.
- **Frontend:** 9 vitest cases covering mode detection/override, the day
override, and column hiding.
- New `__()` keys added to `lang/es.json`.
## Notes
- Adds migration `add_analysis_mode_to_saved_filters_table`.
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