[chore/frontend] Tweak threading a bit, inform about hidden replies (#3097)

* [chore/frontend] Tweak threading a bit, inform about hidden replies

* whoops

* round off bottom of replies col-header if no replies visible

internal/api/model/status.go

@@ -126,8 +126,17 @@ type WebStatus struct {
 	// display this status in the web view.
 	Indent int
 
-	// This status is the first status after
-	// the "main" thread, so it and everything
+	// This status is the last visible status
+	// in the main thread, so everything below
+	// can be considered "replies".
+	ThreadLastMain bool
+
+	// This status is the one around which
+	// the thread context was constructed.
+	ThreadContextStatus bool
+
+	// This status is the first visibile status
+	// after the "main" thread, so it and everything
 	// below it can be considered "replies".
 	ThreadFirstReply bool
 }

internal/api/model/statuscontext.go

@@ -29,15 +29,16 @@ type ThreadContext struct {
 }
 
 type WebThreadContext struct {
-	// Parents in the thread.
-	Ancestors []*WebStatus `json:"ancestors"`
+	// Status around which this
+	// thread ctx was constructed.
+	Status *WebStatus
 
-	// Children in the thread.
-	Descendants []*WebStatus `json:"descendants"`
-
-	// The status around which the ancestors
-	// + descendants context was constructed.
-	Status *WebStatus `json:"-"`
+	// Ordered slice of statuses
+	// for rendering in template.
+	//
+	// Includes ancestors, target
+	// status, and descendants.
+	Statuses []*WebStatus
 
 	// Total length of
 	// the main thread.