ssb: Hint at follow depth with profile image shape. Also, reload follow information the same way we re-determine channel unread status. Let's see if this feels good.

src/ssb.db.h

@@ -286,6 +286,8 @@ typedef struct _tf_ssb_following_t
 	int followed_by_count;
 	/** The number of known users blocking the account. */
 	int blocked_by_count;
+	/** Degree of separation between initial accounts and this account. */
+	int depth;
 	/** The account's identity. */
 	char id[k_id_base64_len];
 } tf_ssb_following_t;