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-window.el

@@ -35,7 +35,7 @@
           "\\*Ibuffer\\*"
           "Buffers\\*$"
           "\\*Geiser Debug\\*"
-          "\\*Kimi-Code\\*"
+          "\\*gptel-Kimi-Code\\*"
           "\\*gptel-agent:.*\\*"
           "^magit"
           bookmark-bmenu-mode
@@ -81,7 +81,9 @@
           "\\*docker-containers\\*" "\\*docker-images\\*" "\\*docker-networks\\*" "\\*docker-volumes\\*"
           "\\*prolog\\*" inferior-python-mode inf-ruby-mode swift-repl-mode
           "\\*rustfmt\\*$" rustic-compilation-mode rustic-cargo-clippy-mode
-          rustic-cargo-outdated-mode rustic-cargo-test-mode))
+          rustic-cargo-outdated-mode rustic-cargo-test-mode
+
+	  "^\\*\\[D\\] FILE backlinks for" "^\\*Denote HEADING backlinks for"))
 
   (when (display-grayscale-p)
     (setq popper-mode-line