audit 4: cards ordered by number, a notification owed to each recipient

The cards layout (owner, 2026-10-13; the mockup first, b90a2f0): box_open
writes data-order for a box with InCards and a number, and panel.css orders
by it up to twelve - Health's eight and the kit's three.
TestCardsBoxesCarryTheirNumberAsTheirOrder reads the rendered pages.

Notifications (owner, 2026-10-14): migration 0011, notify_addressees. open
sends a subject's first message to every recipient and records who was
handed it; followUp, on every check while the subject is open and still
wrong, hands it to the owed and untold who are still recipients; closed
sends the end to the told (all recipients for a subject from before the
table). Tests: a failed copy goes out at the next check, once; the hourly
ceiling holds one back; a user added mid-subject hears nothing of it.

Also in the roadmap, from the owner today: dns-record-collapse,
notification-mail-recheck, settings-save-row (agreed, design first).

Tested on the test server: go vet + go test of 25 packages, make e2e (all
pass, 644 s) on this tree.

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

internal/web/view/components.go

@@ -12,6 +12,7 @@ package view
 import (
 	"fmt"
 	"html/template"
+	"strconv"
 	"strings"
 )
 
@@ -301,6 +302,26 @@ type Box struct {
 	OOB bool
 	// DomainPick: see Box.
 	DomainPick bool
+	// InCards is a box of the cards layout, which orders its boxes on a
+	// phone by their numbers (Order).
+	InCards bool
+}
+
+// Order is a cards box's number as the layout orders it on a phone
+// (data-order, panel.css: the boxes come in the order of their numbers
+// whichever stack they stand in): "3" for "03", empty for a box with no
+// number or outside the layout. Before, the stylesheet ordered by a box's place in its stack and
+// knew four to a stack; a fifth landed out of place with nothing failing
+// (owner, 2026-10-13).
+func (b Box) Order() string {
+	if !b.InCards {
+		return ""
+	}
+	n, err := strconv.Atoi(b.No)
+	if err != nil || n < 1 {
+		return ""
+	}
+	return strconv.Itoa(n)
 }
 
 // HelpLink is a Box's link to its Help topic.