refactor(config): Update Emacs configuration across multiple modules

- Prefix gptel backend names with "gptel-" for consistency
- Add denote-org-backlinks-for-heading keybinding
- Refine recentf exclusions for org journal files
- Remove org-default-priority setting
- Add gptel and denote backlink buffer rules to ibuffer
- Enable markdown-ts-mode for Emacs 31+ with truncate lines
- Add electric-pair support for equals sign
- Update popper and window management regexes for new buffer names

lisp/init-package.el

@@ -228,26 +228,27 @@ targets."
 	   ("Scheme" (or
 		      (mode . scheme-mode)
 		      (name . "^*Geiser")))
+	   ("gptel" (or
+		     (name . "^\\*gptel")))
 	   ("Text" (or
 		    (mode . org-mode)
-		    (mode . markdown-mode)))
+		    (mode . markdown-mode)
+		    (name . "^\\*\\[D\\] FILE backlinks for")))
 	   ("Emacs" (or
                      (name . "^\\*Help\\*$")
                      (name . "^\\*Custom.*")
-                     (name . "^\\*Org Agenda\\*$")
                      (name . "^\\*info\\*$")
-                     (name . "^\\*Backtrace\\*$")
                      (name . "^\\*Messages\\*$")
 		     (name . "*Chinese-word-segmentation*")
-		     (name . "^*Buffer List*")
-		     (name . "*Calendar*")))
+		     (name . "^*Buffer List*")))
 	   ("Magit" (or
                      (mode . magit-blame-mode)
                      (mode . magit-cherry-mode)
                      (mode . magit-diff-mode)
                      (mode . magit-log-mode)
                      (mode . magit-process-mode)
-                     (mode . magit-status-mode)))
+                     (mode . magit-status-mode)
+		     (mode . magit-revision-mode)))
 	   ("Directories" (or
 			   (mode . dired-mode)
 			   (name . "^*dirvish")))