org-super-agenda: fix sorting and grouping

- Priority-based sorting within groups (A > B > C)
- Overdue deadlines at top
- Due today / scheduled today separated
- Due soon (upcoming deadlines) in own group
- No duplicates (items match first group only)
- Kyndryl/ZTJ groups by tag without deadline overlap

config.el

@@ -1446,22 +1446,27 @@ Skip for beamer exports — beamer uses adjustbox on plain tabular."
 (use-package! org-super-agenda
   :after org-agenda
   :config
+  ;; Sorting: priority first, then deadline, then scheduled
+  (setq org-agenda-sorting-strategy
+        '((agenda priority-down deadline-up scheduled-up)
+          (todo priority-down deadline-up)
+          (tags priority-down deadline-up)))
+
   (setq org-super-agenda-groups
-        '((:name "Kyndryl — today"
-           :and (:tag ("kyndryl" "work") :scheduled today))
-          (:name "Kyndryl — deadline"
-           :and (:tag ("kyndryl" "work") :deadline t))
-          (:name "Kyndryl"
-           :tag ("kyndryl" "work"))
-          (:name "ZTJ — today"
-           :and (:tag "ztj" :scheduled today))
-          (:name "ZTJ"
-           :tag "ztj")
-          (:name "Today"
-           :scheduled today
+        '((:name "Overdue"
+           :deadline past)
+          (:name "Due today"
            :deadline today)
+          (:name "Scheduled today"
+           :scheduled today)
+          (:name "Due soon"
+           :deadline future)
           (:name "Waiting"
            :todo "WAIT")
+          (:name "Kyndryl"
+           :tag ("kyndryl" "work"))
+          (:name "ZTJ"
+           :tag "ztj")
           (:name "Other"
            :anything t))))