Tinker with Gnus' summary line format

Trying out some inspiration taken from https://baty.net/posts/2025/03/using-gnus-for-email/.

init.el

@@ -1688,7 +1688,7 @@ Note that this workaround is incomplete, as explained in this comment."
               gnus-fetch-old-headers nil
               gnus-auto-select-first nil
               gnus-auto-select-next nil
-              gnus-summary-line-format "%U%O%R%6k %(%&user-date;  %-13,13f  %B%s%)\n"
+              gnus-summary-line-format "%U%ub%R%O%6k  %(%&user-date;  %-18,18f  %B%s%)\n"
               gnus-thread-sort-functions '(gnus-thread-sort-by-most-recent-date)
               gnus-subthread-sort-functions '(gnus-thread-sort-by-date)
               gnus-thread-hide-subtree t
@@ -1791,7 +1791,7 @@ Note that this workaround is incomplete, as explained in this comment."
                                              ("^nnir" t)
                                              ("^nnmaildir" t)
                                              ("INBOX$" t))
-              gnus-registry-max-entries 5000
+              gnus-registry-max-entries 10000
               gnus-registry-track-extra '(sender subject recipient)
               gnus-registry-cache-file (expand-file-name "gnus.registry.eioioi"
                                                          emacs-d)))