inbound-antispam-panel: Inbound log, Why as a sheet; no Deny on a Postfix reject

Follows the two design commits before it (owner's decisions quoted
there).

Kit: a new component, Sheet / SheetRow (components.go), partials
sheet_tag and sheet (components.html), its rules in panel.css as in
theme.css, and its sample on the kit page next to status_tag. It is
the browser's popover: no script.

Inbound log: the Why column is gone; the decision tag opens a sheet
with who decided, then either the filter's verdict and its symbols one
a line (a detail the journal milter wrote) or the reply (a detail the
tailer read from mail.log - it starts with its code), and the subject
whole. The sheet's id is the journal row's. A row Postfix itself
refused no longer links to the filter lists.

Tests: the page fixture and view tests for the sheet's markup and
content (TestWhyRows), the link rule, three Deny and two Allow on the
mockup's six rows; e2e reads "Decided by" and "Reply" from the sheet
and wants no sender link on the refused row.

Seen: the fixture page with a sheet open, headless Edge at 1360 px -
the same as the accepted drawing.

Checked on the test server, uncommitted tree: go vet ./... ok,
go test ./... ok (22 packages), make e2e ok.

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

internal/web/view/fixtures_test.go

@@ -420,12 +420,14 @@ func userDeleteFixture() *UserDelete {
 func inLogFixture() *InLog {
 	p := NewInLog(admin(), 90, []string{"lists.example.org", "acme.io"},
 		InLogFilter{From: "2026-09-14", To: "2026-09-21"})
+	var id int64
 	row := func(clock, from, client, to, subject, decision, engine, detail string) InLogRow {
 		at, err := time.Parse("2006-01-02 15:04:05", "2026-09-21 "+clock)
 		if err != nil {
 			panic(err)
 		}
-		return p.NewRow(InLogRowInput{At: at, From: from, Client: client, To: to, Subject: subject,
+		id++
+		return p.NewRow(InLogRowInput{ID: id, At: at, From: from, Client: client, To: to, Subject: subject,
 			Decision: decision, Engine: engine, Detail: detail})
 	}
 	return p.WithRows([]InLogRow{