fix: replace `e>|` with `|` in nushell integration to restore history recording (#3358)

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## Summary

Fix nushell history recording completely broken since v18.13.0. No
commands are recorded because `ATUIN_HISTORY_ID` is always set to an
empty string.

Closes #3308

## Root Cause

PR #3183 (first included in v18.13.0) changed the `_atuin_pre_execution`
hook:

```diff
- $env.ATUIN_HISTORY_ID = (atuin history start -- $cmd)
+ $env.ATUIN_HISTORY_ID = (atuin history start -- $cmd e>| complete | get stdout | str trim)
```

The intent was to silence DB errors (e.g. when disk is full) by using
`complete` to swallow failures. However, `e>|` redirects exclusively
stderr into the pipe, dropping stdout. `complete` then sees atuin's
stdout in the `stderr` field and the `stdout` field is empty. The result
is that `ATUIN_HISTORY_ID` is always empty, and no commands are ever
recorded.

All nushell versions are affected. Not only 0.111.0, as I incorrectly
wrote in [the
issue](https://github.com/atuinsh/atuin/issues/3308#issuecomment-4113840110).

## Fix

Replace `e>|` with `|`. The `| complete | get stdout` pattern still
silences errors: `complete` captures stdout, stderr, and exit code into
a record, and `get stdout` discards the rest, preserving the error
suppression from #3183 without breaking stdout capture.

## Testing

Tested with nix shells across three nushell versions (0.98, 0.103,
0.111):

**History recording:**

| Version | `e>\| complete \| get stdout` | `\| complete \| get stdout`
|

|---------|-------------------------------|------------------------------|
| 0.98 | empty (broken) | valid history ID |
| 0.103 | empty (broken) | valid history ID |
| 0.111 | empty (broken) | valid history ID |

**Error silencing** (verified `| complete | get stdout` on a failing
command):

| Version | Error shown to user? | stdout field |
|---------|---------------------|--------------|
| 0.98    | No                  | empty        |
| 0.103   | No                  | empty        |
| 0.111   | No                  | empty        |



## Checks
- [x] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [x] I have checked that there are no existing pull requests for the
same thing

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