feat: add stats page

internal/model/social.go

@@ -25,6 +25,14 @@ type Post struct {
 	// always false for anonymous viewers (no viewer = no reshare state).
 	// Drives the post-card "Reshare ↔ Send" swap on the frontend.
 	ViewerHasReshared bool `json:"viewer_has_reshared"`
+
+	// ResharedAt is the timestamp at which the feed owner reshared this
+	// post. Non-nil only for rows that appear in a profile feed because
+	// the profile owner reshared them (i.e. the row comes from the
+	// post_reshares union branch of ListByUser / ListByHandle).
+	// Authored-by-feed-owner rows leave this nil. Drives the
+	// "↻ Reshared" badge in the post card.
+	ResharedAt *time.Time `json:"reshared_at,omitempty"`
 }
 
 // PostImage represents one attached image on a post.