fix: Binance Spot export format change (UTC_Time→Time, YY year)

[przemyslawbialon]

Problem

Binance changed the Spot transaction history CSV format. Running the existing importer on a current export crashes:

```
File "pit38/plugins/crypto/binance/csv.py", line 22, in init
self.utc_time = datetime.strptime(row["utc_time"], "%Y-%m-%d %H:%M:%S")
KeyError: 'utc_time'
```

What changed

Element	Old	New
Columns	`UTC_Time, Account, Operation, Coin, Change, Remark`	`User ID, Time, Account, Operation, Coin, Change, Remark`
Time column name	`UTC_Time`	`Time`
Year format	`2024-07-25 21:30:41`	`24-07-25 21:30:41`
Leading column	—	`User ID`

Fix

Two-line change in `BinanceTransaction.init`:

• `row["utc_time"]` → `row["time"]`
• date format `%Y` → `%y`

The new `User ID` column is simply ignored (parser never reads it). BOM + lowercase headers already handled by `open_csv_reader`.

Scope

Only the format change. No backward compatibility with pre-2025 exports — users with stale files can re-download from the Binance portal.

Out of scope (follow-up candidates)

• `FiatValue.currency` gets populated with the raw "PLN" string instead of `Currency.ZLOTY`. Pre-existing quirk; tests assert on components so they stay honest without endorsing the drift.
• Timezone handling — filename is `(UTC+2)`, parser treats timestamps as UTC. Can shift transactions across NBP business-day boundaries in edge cases.
• `Transaction Sell` operations (`# TODO: handle sell operations` in the source). Not in the sample file.

Tests

• New `tests/test_binance_csv.py` — 6 unit tests (first-ever Binance tests in this repo).
• New `tests/e2e/fixtures/binance_transaction_history.csv` — 7 rows, anonymized (`User ID` 999999999, round amounts).
• New `test_import_binance` CliRunner case in `tests/e2e/test_cli_e2e.py` — parity with revolut-stock and ibi-capital.
• Manually verified on the user's real 20-row export: 6 transactions extracted, fee aggregated correctly into asset amount.

Test plan

• `pytest tests/` — 182 → 189 passed, zero regressions
• `flake8 pit38/plugins/crypto/binance/ --select=E9,F63,F7,F82` clean
• Manual: `pit38 import binance -i ` exits 0 and produces CSV
• Manual: `pit38 crypto -f -y 2024` runs end-to-end

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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