feat(mu4e): unread bookmarks, better thread UI, cursor on subject

config.el

@@ -621,10 +621,46 @@ and optional priority indicator [#A]."
         mu4e-headers-include-related  t
         mu4e-use-fancy-chars          t
         mu4e-headers-mark-for-thread  t
-        mu4e-headers-fields '((:human-date . 12)
-                               (:flags      . 6)
-                               (:from       . 22)
-                               (:subject))))
+        mu4e-headers-fields '((:human-date  . 12)
+                               (:flags       . 6)
+                               (:from-or-to . 25)
+                               (:subject))
+        ;; Sort: newest first
+        mu4e-headers-sort-field      :date
+        mu4e-headers-sort-direction  'descending
+        ;; Thread prefixes — fancy Unicode
+        mu4e-headers-thread-single-orphan-prefix '("─>" . "─▶ ")
+        mu4e-headers-thread-orphan-prefix        '("┬>" . "┬▶ ")
+        mu4e-headers-thread-connection-prefix    '("│"  . "│ ")
+        mu4e-headers-thread-first-child-prefix   '("├>" . "├▶ ")
+        mu4e-headers-thread-last-child-prefix    '("└>" . "└▶ ")
+        mu4e-headers-thread-duplicate-prefix     '("="  . "≡ "))
+  ;; Bookmarks — unread first
+  (setq mu4e-bookmarks
+        '((:name "Unread" :query "flag:unread"             :key ?u)
+          (:name "Inbox"  :query "maildir:/personal/INBOX" :key ?i)
+          (:name "Today"  :query "date:today"              :key ?t)
+          (:name "Week"   :query "date:7d..now"            :key ?w)))
+  ;; Maildir shortcuts
+  (setq mu4e-maildir-shortcuts
+        '(("/personal/INBOX"   . ?i)
+          ("/personal/Sent"    . ?s)
+          ("/personal/Trash"   . ?t)
+          ("/personal/Archive" . ?a)))
+  ;; Cursor on subject column after j/k navigation
+  (defun my/mu4e-goto-subject (&rest _)
+    "Move cursor to the subject column in mu4e headers."
+    (when (derived-mode-p 'mu4e-headers-mode)
+      (beginning-of-line)
+      (let ((offset 0))
+        (catch 'found
+          (dolist (field mu4e-headers-fields)
+            (if (eq (car field) :subject)
+                (throw 'found nil)
+              (setq offset (+ offset (or (cdr field) 0) 1)))))
+        (forward-char offset))))
+  (advice-add 'mu4e-headers-next :after #'my/mu4e-goto-subject)
+  (advice-add 'mu4e-headers-prev :after #'my/mu4e-goto-subject))
 
 (after! mu4e
   (setq sendmail-program                  "msmtp"