## Problem
Update button in edit account modal showed hardcoded English (`Update` /
`Updating...`) instead of translated text.
## Fix
Wrap button label in `__()` so it resolves the existing `es.json` keys
(`Actualizar` / `Actualizando...`).
## Test
`edit-account-dialog.test.tsx` passes.
## Why
Some banks return transactions without a balance column. The CSV/Excel
importer happily creates the transactions but leaves the account without
any balance history, making the account look incomplete.
## What
Opt-in flow that derives per-day balances from the transactions
themselves, using a single reference point (the balance on the date of
the latest transaction).
### Mapping step
- New checkbox **"Calculate balances from transactions"** next to the
Balance column select.
- Available only when no balance column is mapped (disabled + visually
faded otherwise).
- When checked, a balance input appears labeled with the latest
transaction date using a relative format:
- `Today`
- `Yesterday`
- `Monday, 3 of Jun`
- If an `AccountBalance` already exists for that date, it is pre-filled
automatically (no need to ask) with a small hint.
- The reference balance is **mandatory** when the checkbox is checked;
the Next button is disabled until it is provided.
### Preview step
- A new `Balance` column shows the balance about to be created for each
date, regardless of whether it came from the file or was calculated.
### Persistence
- Balances are computed by walking backwards across distinct transaction
dates and subtracting each day's net movement.
- They flow through the existing import path that POSTs to
`AccountBalanceController@store`, so no new endpoint was needed.
## Feature flag
Hidden behind a new Pennant feature, **off by default**:
```bash
php artisan feature:enable CalculateBalancesOnImport user@example.com
# or
php artisan feature:enable CalculateBalancesOnImport all
```
The flag is exposed to the frontend via Inertia shared props
(`features.calculateBalancesOnImport`).
## Tests
- New vitest cases for `getLatestTransactionDate` and
`calculateBalancesFromTransactions` (sparse dates, reference date
without txns, empty list).
- `LocalizationTest` passes (new ES strings added).
- Full vitest suite green (106 tests).
## Summary
- Adds a **Monthly / Daily granularity toggle** to the account balance
evolution chart on account pages
- Daily view renders as an **area chart** (line with gradient fill)
showing the last 30 days, while monthly keeps the existing bar chart
- All 3 chart view modes (stacked, period-over-period,
period-over-period %) work in both granularities
- Chart view toggle **tooltips update dynamically** based on granularity
(e.g. "Month over month change" → "Day over day change")
- Backend fills gaps in sparse `account_balances` data by carrying
forward the last known balance day-by-day
- Includes 3 new Pest tests for the daily endpoint (data points,
gap-filling, forbidden access)
## Screenshot
<img width="1271" height="743" alt="image"
src="https://github.com/user-attachments/assets/cca7a7ad-bdcc-45d2-a5e1-47b1cb855d49"
/>
<img width="1274" height="755" alt="image"
src="https://github.com/user-attachments/assets/14e1f2d8-41cd-49cc-b0f4-307edb847af8"
/>
Víctor Falcón