settings-save-row: the Settings form is the left column

The owner chose Variant 2 on 2026-10-16 ("форма в левой колонке, кнопка
под своими полями"); the mockup is f95c553. Server › Settings: the form
wraps only the left column - Log retention, Notifications and Save
settings under them - and the right column, outside the form, holds
Notification mail and the read-only Sending rate limits. The boxes are
renumbered column by column (Notifications 02, Notification mail 03,
Sending rate limits 04). The fields, their names and the POST are
unchanged.

Tests: the page's outline matches the mockup's (TestPanelOutlinesMatchMockups);
go vet + go test (26 packages) and make e2e on the test server for this
tree.

CHANGELOG [Unreleased]; roadmap row done, its section quotes the choice.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/roadmap.md

@@ -39,7 +39,7 @@ in `git log` and [CHANGELOG.md](../CHANGELOG.md).
 | password-reset | Password reset by e-mail | agreed (2026-10-13) | — | — |
 | local-time | The panel shows time, and counts its days, in a time zone other than UTC | agreed (2026-10-13; design questions open) | — | — |
 | notification-mail-recheck | The Notification mail records on Server › Settings can be checked again from where they are shown | agreed (2026-10-15) | — | — |
-| settings-save-row | Server › Settings: the Save button no longer stands alone under a long right column | agreed (2026-10-15) | — | — |
+| settings-save-row | Server › Settings: the Save button no longer stands alone under a long right column | done 2026-10-16, unreleased | — | — |
 | dns-record-collapse | A DNS record that is right is shown folded: its name and its tag, the values on request | done 2026-10-16, unreleased | — | — |
 | go-milter-upstream | Prepare an issue and a PR for go-milter: its header map outlives a message and is unbounded | prepared 2026-10-16, the owner posts | — | [third_party/go-milter/PATCHES.md](../third_party/go-milter/PATCHES.md) |
 | own-mta-builds | Analysis: build Postfix and OpenDKIM ourselves, patched, instead of Debian's packages | analysed 2026-10-15: no own builds; three rows proposed instead | — | [own-mta-builds-2026-10-15.md](own-mta-builds-2026-10-15.md) |
@@ -887,6 +887,15 @@ form's columns, or the button nearer its fields. Decide with the mockup,
 after dns-record-collapse, on a page whose records are missing as well as
 on one whose records are right.
 
+**Done (2026-10-16):** shown both layouts in both states, the owner chose
+"Вариант 2: форма в левой колонке, кнопка под своими полями." Folding alone
+closed the gap only while the records are right. The form is now the left
+column - 01 Log retention, 02 Notifications, *Save settings* - and the
+right column, outside it, holds 03 Notification mail and 04 Sending rate
+limits. It also leaves room for
+[notification-mail-recheck](#notification-mail-recheck): a *Re-check DNS*
+form in the Notification mail box is no longer a form inside a form.
+
 ## go-milter-upstream
 
 **Problem (owner, 2026-10-16):** the panel builds go-milter v0.4.1 patched