Cannot find Homebrew-installed `wakatime-cli` on Apple Silicon Macs

[skkzsh]

Problem

The README says brew install wakatime-cli, but wakatime-mode cannot find the binary on Apple Silicon Macs.

Cause

$ where wakatime-cli
/opt/homebrew/bin/wakatime-cli

Homebrew's prefix on Apple Silicon is /opt/homebrew, but wakatime-find-binary only checks /usr/local/bin, ~/.wakatime/, etc.
The executable-find fallback at the end looks for "wakatime", not "wakatime-cli", so it never matches.

wakatime-mode/wakatime-mode.el

Lines 103 to 143 in 1c5b225

	(defun wakatime-find-binary (program)
	"Find the full path to an executable program."
	(cond
	((file-exists-p (format "/usr/local/bin/%s" program))
	(format "/usr/local/bin/%s" program))
	((file-exists-p (format "/usr/bin/%s" program))
	(format "/usr/bin/%s" program))
	((file-exists-p (format "/bin/%s" program))
	(format "/bin/%s" program))
	((file-exists-p (format "/usr/local/sbin/%s" program))
	(format "/usr/local/sbin/%s" program))
	((file-exists-p (format "/usr/sbin/%s" program))
	(format "/usr/sbin/%s" program))
	((file-exists-p (format "/sbin/%s" program))
	(format "/sbin/%s" program))
	;; For linux users
	((file-exists-p "~/.wakatime/wakatime-cli")
	"~/.wakatime/wakatime-cli")
	;; For windows 10+ fix to get wakatime-cli.exe
	((file-exists-p (concat
	(string-replace "\\" "/" (concat
	(substitute-env-vars "$HOMEDRIVE")
	(substitute-env-vars "$HOMEPATH")))
	(format "/.wakatime/%s" program)))
	(concat (string-replace "\\" "/" (concat
	(substitute-env-vars "$HOMEDRIVE")
	(substitute-env-vars "$HOMEPATH")))
	(format "/.wakatime/%s" program)))
	;; For windows 10+ fix to get wakatime-cli-amd64.exe
	((file-exists-p (concat
	(string-replace "\\" "/" (concat
	(substitute-env-vars "$HOMEDRIVE")
	(substitute-env-vars "$HOMEPATH")))
	"/.wakatime/wakatime-cli-windows-amd64.exe"))
	(concat (string-replace "\\" "/" (concat
	(substitute-env-vars "$HOMEDRIVE")
	(substitute-env-vars "$HOMEPATH")))
	"/.wakatime/wakatime-cli-windows-amd64.exe"))
	((not (s-blank (executable-find "wakatime")))
	(executable-find "wakatime"))
	(t program)))

Suggested fix

Make executable-find the primary method, while keeping /opt/homebrew/bin and /usr/local/bin as hardcoded fallbacks for GUI Emacs environments where $PATH may be incomplete.
This also covers #72, which similarly proposed switching to executable-find:

(defun wakatime-find-binary (program)
  (cond
    ((executable-find program))
    ((file-exists-p (format "/opt/homebrew/bin/%s" program))
      (format "/opt/homebrew/bin/%s" program))
    ((file-exists-p (format "/usr/local/bin/%s" program))
      (format "/usr/local/bin/%s" program))
    ((file-exists-p "~/.wakatime/wakatime-cli")
      "~/.wakatime/wakatime-cli")
    ;; ... Windows paths
    (t program)))