Day-of and crock-pot start-by reminders (Feature 20) (#177)

Co-authored-by: dev_agent <dev_agent@cubecraftlabs.com>

internal/chat/messages.go

@@ -65,12 +65,27 @@ func ListReady(week store.LocalDate, needed, dinners int) notify.Event {
 }
 
 // DayOfReminder is the day_of_reminder event of the dinner dinnerID, named
-// name, planned on date.
+// name, planned on date: "Tonight: Tacos · Recipe →", a title carrying its
+// own call to action.
 func DayOfReminder(date store.LocalDate, dinnerID, name string) notify.Event {
 	return notify.Event{
 		Type:  notify.DayOfReminder,
 		Key:   string(notify.DayOfReminder) + ":" + date.String(),
-		Title: "Tonight's dinner",
+		Title: "Tonight: " + name + " · Recipe →",
+		URL:   "/dinner/" + dinnerID,
+		Week:  household.WeekStart(date),
+	}
+}
+
+// StartReminder is the day_of_reminder event, keyed
+// day_of_reminder:start:{date}, reminding the household to start the
+// crock-pot dinner dinnerID, named name and planned on date, by startBy,
+// a time in the household zone: "Start the crock pot by 9:30 am".
+func StartReminder(date store.LocalDate, dinnerID, name string, startBy time.Time) notify.Event {
+	return notify.Event{
+		Type:  notify.DayOfReminder,
+		Key:   string(notify.DayOfReminder) + ":start:" + date.String(),
+		Title: "Start the crock pot by " + startBy.Format("3:04 pm"),
 		Body:  name,
 		URL:   "/dinner/" + dinnerID,
 		Week:  household.WeekStart(date),
@@ -173,9 +188,13 @@ func planTitle(week, thisWeek store.LocalDate) string {
 }
 
 // Text is the Google Chat message of p: its title, its body after a colon
-// and the event's call to action with an arrow.
+// and the event's call to action with an arrow. A title ending in an arrow,
+// with no body, carries its own call to action and is the message as it is.
 func Text(p notify.Payload) string {
 	text := p.Title
+	if p.Body == "" && strings.HasSuffix(text, "→") {
+		return text
+	}
 	if p.Body != "" {
 		if endsSentence(text) {
 			text += " "

internal/chat/messages_test.go

@@ -2,6 +2,7 @@ package chat
 
 import (
 	"testing"
+	"time"
 
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/notify"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
@@ -100,9 +101,19 @@ func TestMessages(t *testing.T) {
 			key:   "day_of_reminder:2026-10-15",
 			url:   "/dinner/01J9Z8Y7X6W5V4T3S2R1Q0P9N8",
 			week:  "2026-10-12",
-			title: "Tonight's dinner",
-			body:  "Tacos",
-			chatT: "Tonight's dinner: Tacos. Open the recipe →",
+			title: "Tonight: Tacos · Recipe →",
+			body:  "",
+			chatT: "Tonight: Tacos · Recipe →",
+		},
+		{
+			name:  "crock-pot start reminder",
+			ev:    StartReminder(mustDate(t, "2026-10-15"), "01J9Z8Y7X6W5V4T3S2R1Q0P9N8", "Beef Chili", time.Date(2026, 10, 15, 9, 30, 0, 0, time.FixedZone("CDT", -5*60*60))),
+			key:   "day_of_reminder:start:2026-10-15",
+			url:   "/dinner/01J9Z8Y7X6W5V4T3S2R1Q0P9N8",
+			week:  "2026-10-12",
+			title: "Start the crock pot by 9:30 am",
+			body:  "Beef Chili",
+			chatT: "Start the crock pot by 9:30 am: Beef Chili. Open the recipe →",
 		},
 		{
 			name:  "new suggestions",