chore(config): Refactor Emacs configuration with multiple improvements

- Replace projectile with built-in project.el
- Add cal-china-x for Chinese lunar calendar support
- Add dired-gitignore integration with dirvish
- Add mwim for smarter line navigation
- Add keycast mode for key display
- Add ef-themes theme collection
- Improve corfu terminal handling for Emacs 31+
- Add gptel-agent-project and consult-ripgrep-project helpers
- Remove custom.el from repo, support init-local.el for local config
- Update theme faces for transient, keycast, and calendar holidays
- Various keybinding additions and cleanup

lisp/init-kbd-func.el

@@ -154,6 +154,17 @@ Disable jinx-mode if it's enable and global-jinx-mode is disable , otherwise tog
     (dolist (buf buffers)
       (persp-set-buffer buf))))
 
+(defun gptel-agent-project ()
+  "Run `gptel-agent' in current project's root (by run it with prefix argument)."
+  (interactive)
+  (let ((current-prefix-arg '-))
+    (call-interactively 'gptel-agent)))
+
+(defun consult-ripgrep-project ()
+  "Run `consult-ripgrep' in current project's root."
+  (interactive)
+  (when-let* ((proj (project-current t)))
+      (consult-ripgrep (project-root proj))))
 
 (provide 'init-kbd-func)