Mark unfrozen Supply archive posts and open them in the Supply run

The Supply archive presented every post as a frozen, read-only list, even a
past week's Supply run that week_rollover had not frozen and that the
Supply run route could still change. Each archive post now carries frozen;
a post not yet frozen is marked (Current, or Still open for a past week)
and links to the Supply run, where it can still change. Only frozen posts
open read-only in the archive.

Maestro task 29b629aa-1ad9-48a3-be75-0380b645d4fe

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

internal/shopping/archive.go

@@ -152,6 +152,11 @@ type Post struct {
 	Items, OnHand int
 	// Current is true for the household's current week.
 	Current bool
+	// Frozen is true once the list is frozen into the Supply archive and
+	// can no longer change. A list not yet frozen — the current week's, or
+	// a past week's that week_rollover has not frozen — can still be
+	// changed from the Supply run.
+	Frozen bool
 }
 
 // Archive returns the Supply archive: the Supply run of every week up to
@@ -208,7 +213,7 @@ func (s *Service) Archive(ctx context.Context, by string) (out []Period, err err
 		if err != nil {
 			return nil, err
 		}
-		p, err := postOf(monday, l, monday == thisWeek)
+		p, err := postOf(monday, l, monday == thisWeek, frozen(row))
 		if err != nil {
 			return nil, err
 		}
@@ -223,7 +228,7 @@ func (s *Service) Archive(ctx context.Context, by string) (out []Period, err err
 
 // postOf is l, the Supply run of the week starting monday, as a post in
 // the Supply archive.
-func postOf(monday store.LocalDate, l List, current bool) (Post, error) {
+func postOf(monday store.LocalDate, l List, current, isFrozen bool) (Post, error) {
 	label, err := household.WeekLabel(monday)
 	if err != nil {
 		return Post{}, fmt.Errorf("shopping: Supply run %s: %w", l.ID, err)
@@ -241,5 +246,6 @@ func postOf(monday store.LocalDate, l List, current bool) (Post, error) {
 		Items:     c.Total,
 		OnHand:    c.Total - c.Needed,
 		Current:   current,
+		Frozen:    isFrozen,
 	}, nil
 }

internal/shopping/archive_test.go

@@ -381,6 +381,9 @@ func postLine(p shopping.Post) string {
 	if p.Current {
 		cur = " | current"
 	}
+	if !p.Frozen {
+		cur += " | open"
+	}
 	return p.WeekStart + " " + p.Label + " | " + title + " | " + strings.Join(p.Dinners, ", ") + " | " +
 		strconv.Itoa(p.Items) + " items, " + strconv.Itoa(p.OnHand) + " on hand" + cur
 }
@@ -427,7 +430,7 @@ func TestArchiveGroups(t *testing.T) {
 	}
 
 	posts := map[string]string{
-		"jan": "2027-01-04 Week 1 · Jan 4 – 10 | - | Pad Thai, Beef Chili | 5 items, 1 on hand | current",
+		"jan": "2027-01-04 Week 1 · Jan 4 – 10 | - | Pad Thai, Beef Chili | 5 items, 1 on hand | current | open",
 		"dec": "2026-12-28 Week 53 · Dec 28 – Jan 3 | Chili, Noodles & Co | Beef Chili, Pad Thai | 5 items, 2 on hand",
 		"d07": "2026-12-07 Week 50 · Dec 7 – 13 | - | Pad Thai | 2 items, 0 on hand",
 		"nov": "2026-11-30 Week 49 · Nov 30 – Dec 6 | - | Pot Roast | 1 items, 1 on hand",