Fix Home dashboard integration findings (Feature 21)

- F21-01: plan_ready and list_ready links carry their week
  (/plan?week=, /plan/shopping?week=), and the Plan opens on ?week=
  and keeps it on the week shown, so an older update opens its week.
- F21-02: a failed refresh of the Rotation check shows its ErrorBanner
  beside the cached pending card instead of replacing it.
- F21-03: Home carries the household's timezone and is read again at
  its next local midnight.
- F21-04: Home counts pending Side quests through a read-only query
  (suggest.PendingCount), so reading Home never writes batches.

Task: ac3dddf0-a05f-4e43-a5ad-3105fe6bdd95

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

internal/chat/chat_test.go

@@ -342,8 +342,8 @@ func TestSendThreadsByWeek(t *testing.T) {
 		t.Errorf("plan text = %q", reqs[0].Body["text"])
 	}
 
-	// The cards' "Open" buttons link under the public URL.
-	for i, wantLink := range map[int]string{0: "https://mealquest.example/plan", 1: "https://mealquest.example/plan/shopping"} {
+	// The cards' "Open" buttons link under the public URL to the event's week.
+	for i, wantLink := range map[int]string{0: "https://mealquest.example/plan?week=2026-10-12", 1: "https://mealquest.example/plan/shopping?week=2026-10-12"} {
 		data, _ := json.Marshal(reqs[i].Body["cardsV2"])
 		var cards []cardV2
 		if err := json.Unmarshal(data, &cards); err != nil || len(cards) != 1 {

internal/chat/messages.go

@@ -2,6 +2,7 @@ package chat
 
 import (
 	"fmt"
+	"net/url"
 	"strings"
 	"time"
 
@@ -46,7 +47,7 @@ func PlanReady(week, thisWeek store.LocalDate, dinners []string) notify.Event {
 		Key:   string(notify.PlanReady) + ":" + week.String(),
 		Title: planTitle(week, thisWeek),
 		Body:  nameList(dinners),
-		URL:   "/plan",
+		URL:   "/plan?" + url.Values{"week": {week.String()}}.Encode(),
 		Week:  week,
 	}
 }
@@ -59,7 +60,7 @@ func ListReady(week store.LocalDate, needed, dinners int) notify.Event {
 		Key:   string(notify.ListReady) + ":" + week.String(),
 		Title: "This week's Supply run is ready",
 		Body:  fmt.Sprintf("%s to buy for %s", count(needed, "item", "items"), count(dinners, "dinner", "dinners")),
-		URL:   "/plan/shopping",
+		URL:   "/plan/shopping?" + url.Values{"week": {week.String()}}.Encode(),
 		Week:  week,
 	}
 }

internal/chat/messages_test.go

@@ -38,7 +38,7 @@ func TestMessages(t *testing.T) {
 			name:  "plan ready",
 			ev:    PlanReady(week, week, []string{"Tacos", "Bolognese", "Tikka masala", "Lemon orzo", "Bibimbap", "Shakshuka", "Chili"}),
 			key:   "plan_ready:2026-10-12",
-			url:   "/plan",
+			url:   "/plan?week=2026-10-12",
 			week:  "2026-10-12",
 			title: "This week's plan is ready",
 			body:  "Tacos, Bolognese, Tikka masala + 4 more",
@@ -48,7 +48,7 @@ func TestMessages(t *testing.T) {
 			name:  "plan ready with three dinners",
 			ev:    PlanReady(week, week, []string{"Tacos", "Bolognese", "Tikka masala"}),
 			key:   "plan_ready:2026-10-12",
-			url:   "/plan",
+			url:   "/plan?week=2026-10-12",
 			week:  "2026-10-12",
 			title: "This week's plan is ready",
 			body:  "Tacos, Bolognese, Tikka masala",
@@ -58,7 +58,7 @@ func TestMessages(t *testing.T) {
 			name:  "plan ready for next week",
 			ev:    PlanReady(week, mustDate(t, "2026-10-05"), []string{"Tacos", "Bolognese", "Tikka masala", "Lemon orzo"}),
 			key:   "plan_ready:2026-10-12",
-			url:   "/plan",
+			url:   "/plan?week=2026-10-12",
 			week:  "2026-10-12",
 			title: "Next week's plan is ready",
 			body:  "Tacos, Bolognese, Tikka masala + 1 more",
@@ -68,7 +68,7 @@ func TestMessages(t *testing.T) {
 			name:  "plan ready for a later week",
 			ev:    PlanReady(mustDate(t, "2026-10-26"), mustDate(t, "2026-10-05"), []string{"Tacos"}),
 			key:   "plan_ready:2026-10-26",
-			url:   "/plan",
+			url:   "/plan?week=2026-10-26",
 			week:  "2026-10-26",
 			title: "The plan for the week of Oct 26 is ready",
 			body:  "Tacos",
@@ -78,7 +78,7 @@ func TestMessages(t *testing.T) {
 			name:  "list ready",
 			ev:    ListReady(week, 19, 7),
 			key:   "list_ready:2026-10-12",
-			url:   "/plan/shopping",
+			url:   "/plan/shopping?week=2026-10-12",
 			week:  "2026-10-12",
 			title: "This week's Supply run is ready",
 			body:  "19 items to buy for 7 dinners",
@@ -88,7 +88,7 @@ func TestMessages(t *testing.T) {
 			name:  "list ready singular",
 			ev:    ListReady(week, 1, 1),
 			key:   "list_ready:2026-10-12",
-			url:   "/plan/shopping",
+			url:   "/plan/shopping?week=2026-10-12",
 			week:  "2026-10-12",
 			title: "This week's Supply run is ready",
 			body:  "1 item to buy for 1 dinner",

internal/home/home.go

@@ -50,6 +50,9 @@ func NewService(settings *household.SettingsService, plans *plan.Service, sugges
 type Home struct {
 	// DateLabel is today in the household's zone, e.g. "Friday, Oct 2".
 	DateLabel string `json:"dateLabel"`
+	// Timezone is the household's IANA zone, whose next local midnight
+	// is when Home is read again for the new day.
+	Timezone string `json:"timezone"`
 	// Tonight is the dinner planned for today on the current week's plan;
 	// nil when the week has no plan.
 	Tonight *Dinner `json:"tonight"`
@@ -92,7 +95,8 @@ type RecentUpdates struct {
 	Unread bool `json:"unread"`
 }
 
-// Get reads the Home screen at the service's "now".
+// Get reads the Home screen at the service's "now". It only reads: it
+// writes nothing, not even the batch bookkeeping a Deck read does.
 func (s *Service) Get(ctx context.Context) (Home, error) {
 	settings, err := s.settings.Get(ctx)
 	if err != nil {
@@ -110,7 +114,7 @@ func (s *Service) Get(ctx context.Context) (Home, error) {
 	if err != nil {
 		return Home{}, err
 	}
-	deck, err := s.suggest.Deck(ctx)
+	sideQuests, err := s.suggest.PendingCount(ctx)
 	if err != nil {
 		return Home{}, fmt.Errorf("home: read deck: %w", err)
 	}
@@ -124,8 +128,9 @@ func (s *Service) Get(ctx context.Context) (Home, error) {
 	}
 	return Home{
 		DateLabel:      now.Format("Monday, Jan 2"),
+		Timezone:       settings.Timezone,
 		Tonight:        tonight,
-		SideQuestCount: len(deck.Suggestions),
+		SideQuestCount: sideQuests,
 		ShoppingList:   list,
 		RecentUpdates:  RecentUpdates{Unread: unread},
 	}, nil

internal/home/home_test.go

@@ -245,6 +245,7 @@ func TestHomeEmpty(t *testing.T) {
 	h := e.at(t, "2026-10-13 23:59")
 	want := home.Home{
 		DateLabel: "Tuesday, Oct 13",
+		Timezone:  zone,
 		ShoppingList: home.ShoppingStatus{
 			WeekStart: "2026-10-12", Label: "Week 42 · Oct 12 – 18",
 		},
@@ -289,6 +290,32 @@ func TestSideQuestCount(t *testing.T) {
 	}
 }
 
+// Reading Home writes nothing: a batch still pending whose job is gone,
+// which a Deck read would fail, is left as it was, and the read succeeds.
+func TestGetDoesNotWriteBatches(t *testing.T) {
+	t.Parallel()
+	e := newEnv(t)
+	ctx := t.Context()
+	created := "2026-10-13T12:00:00.000Z"
+	batch, err := db.New(e.st.Writer).CreateSuggestionBatch(ctx, db.CreateSuggestionBatchParams{ID: store.NewID(), Trigger: "manual", CreatedAt: created, UpdatedAt: created})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if batch.Status != "pending" {
+		t.Fatalf("new batch status = %q, want pending", batch.Status)
+	}
+	if h := e.at(t, "2026-10-13 12:00"); h.SideQuestCount != 0 {
+		t.Errorf("sideQuestCount = %d, want 0", h.SideQuestCount)
+	}
+	var status, updatedAt string
+	if err := e.st.Reader.QueryRowContext(ctx, `SELECT status, updated_at FROM suggestion_batches WHERE id = ?`, batch.ID).Scan(&status, &updatedAt); err != nil {
+		t.Fatal(err)
+	}
+	if status != "pending" || updatedAt != created {
+		t.Errorf("batch after a Home read = %s at %s, want pending at %s", status, updatedAt, created)
+	}
+}
+
 // The Supply run shown is the upcoming week's when it has one, else the
 // current week's; the weeks are the household's local weeks.
 func TestShoppingStatus(t *testing.T) {

internal/plan/plan_test.go

@@ -375,9 +375,9 @@ func TestDraftEmitsPlanReady(t *testing.T) {
 	}
 	for _, r := range rows {
 		p := r.Payload
-		if r.Key != "plan_ready:2026-10-12" || p.Tag != r.Key || p.URL != "/plan" || p.Week != "2026-10-12" ||
+		if r.Key != "plan_ready:2026-10-12" || p.Tag != r.Key || p.URL != "/plan?week=2026-10-12" || p.Week != "2026-10-12" ||
 			p.Title != want.Title || p.Body != "Beef Chili, Pot Roast, Pad Thai + 4 more" {
-			t.Errorf("%s row = %+v, want key plan_ready:2026-10-12, title %q, the drafted dinners and /plan", r.Channel, r, want.Title)
+			t.Errorf("%s row = %+v, want key plan_ready:2026-10-12, title %q, the drafted dinners and /plan?week=2026-10-12", r.Channel, r, want.Title)
 		}
 	}
 

internal/server/home_test.go

@@ -35,6 +35,7 @@ func TestGetHome(t *testing.T) {
 		}
 		body, err := json.Marshal(map[string]any{
 			"dateLabel":      now.In(loc).Format("Monday, Jan 2"),
+			"timezone":       loc.String(),
 			"tonight":        nil,
 			"sideQuestCount": 0,
 			"shoppingList":   map[string]any{"weekStart": week.String(), "label": label, "ready": false, "sentToChatAt": nil},

internal/shopping/notify_test.go

@@ -37,9 +37,9 @@ func TestGenerateEmitsListReadyOnce(t *testing.T) {
 	}
 	for _, r := range rows {
 		p := r.Payload
-		if r.Key != "list_ready:2026-10-12" || p.URL != "/plan/shopping" || p.Week != "2026-10-12" ||
+		if r.Key != "list_ready:2026-10-12" || p.URL != "/plan/shopping?week=2026-10-12" || p.Week != "2026-10-12" ||
 			p.Title != "This week's Supply run is ready" || p.Body != "3 items to buy for 2 dinners" {
-			t.Errorf("%s row = %+v, want list_ready:2026-10-12, 3 items for 2 dinners, /plan/shopping", r.Channel, r)
+			t.Errorf("%s row = %+v, want list_ready:2026-10-12, 3 items for 2 dinners, /plan/shopping?week=2026-10-12", r.Channel, r)
 		}
 	}
 

internal/suggest/suggest.go

@@ -346,6 +346,17 @@ func (s *Service) Deck(ctx context.Context) (Deck, error) {
 	return deck, nil
 }
 
+// PendingCount is how many Side quests are pending on the deck. Unlike
+// Deck it only reads: it does not fail orphaned batches, so a reader such
+// as Home never writes.
+func (s *Service) PendingCount(ctx context.Context) (int, error) {
+	rows, err := db.New(s.st.Reader).ListDeck(ctx)
+	if err != nil {
+		return 0, fmt.Errorf("suggest: list deck: %w", err)
+	}
+	return len(rows), nil
+}
+
 // Decision is a suggestion once decided, with the id of the replenish
 // batch's job when the decision called for one: the batch it started, or
 // the one already pending or running that it joined.