[BUG] No context menu in gitk on macos

# What did you do before the bug happened? (Steps to reproduce your issue)

1. create repo with one commit
2. gitk
3. right click on commit

# What did you expect to happen? (Expected behavior)

See context menu like on Windows

# What happened instead? (Actual behavior)

Nothing

# What's different between what you expected and what actually happened?

# Anything else you want to add:

[System Info]
git version:
git version 2.51.0
cpu: arm64
no commit associated with this build
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
feature: fsmonitor--daemon
libcurl: 8.7.1
zlib: 1.2.12
SHA-1: SHA1_DC
SHA-256: SHA256_BLK
default-ref-format: files
default-hash: sha1
uname: Darwin 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:28:30
PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6030 arm64
compiler info: clang: 17.0.0 (clang-1700.0.13.3)
libc info: no libc information available
$SHELL (typically, interactive shell): /bin/zsh

[Enabled Hooks]