feat: send email notifications for missed messages

- New cron job in cluster
- Handle presence and other concerns
- Toggle in app to disable email notifications
- Handles other edge cases such as cooldown period
- Simple html email with simple message

Closes #117

go/internal/particle/firestore_types.go

@@ -43,12 +43,13 @@ type FirestoreMediaParticleProperties struct {
 }
 
 type FirestoreStreamParticle struct {
-	CreatedByHumanId string `firestore:"created_by_human_id"`
-	Type             string `firestore:"type"`
-	// Properties       FirestoreStreamParticleProperties `firestore:"properties"`
-	CreatedAt                time.Time  `firestore:"created_at,serverTimestamp"`
-	LastChildCreatedAt       *time.Time `firestore:"last_child_created_at,omitempty"`
-	VisibleTo                []string   `firestore:"visible_to"`
-	UpdatedAt                *time.Time `firestore:"updated_at,omitempty"`
-	HuddleActiveParticipants []string   `firestore:"huddle_active_participants,omitempty"`
+	CreatedByHumanId         string               `firestore:"created_by_human_id"`
+	Type                     string               `firestore:"type"`
+	Status                   string               `firestore:"status"`
+	CreatedAt                time.Time             `firestore:"created_at,serverTimestamp"`
+	LastChildCreatedAt       *time.Time            `firestore:"last_child_created_at,omitempty"`
+	VisibleTo                []string              `firestore:"visible_to"`
+	PlaybackMarkers          map[string]time.Time  `firestore:"playback_markers,omitempty"`
+	UpdatedAt                *time.Time            `firestore:"updated_at,omitempty"`
+	HuddleActiveParticipants []string              `firestore:"huddle_active_participants,omitempty"`
 }