fix: make Claude hook paths portable

[0xAndoroid]

1. Makes the path to the hooks use ${HOME} instead of full path to ensure settings can be shared across different machines.
2. Resolves settings.json symlink, if settings.json is a symlink.

[ishefi]

Both fixes are good calls, dotfile-sync portability and the symlink-clobber bug are real annoyances. Two questions before merge:

1. Does Claude Code's hook runner actually expand ${HOME} when it spawns the command, or does it pass the string straight through? If it's the latter, the hook will silently fail to fire after this change. A quick echo test on a fresh install would confirm. Worth a line in the README either way so users know the entry is intentionally unexpanded.

2. readlink -f is GNU-flavored and only landed in macOS 12.3. Probably fine given the project's macOS focus, but a portable alternative (cd "$(dirname "$SETTINGS")" && pwd -P, or python3 -c 'import os,sys;print(os.path.realpath(sys.argv[1]))' "$SETTINGS") would avoid a surprise on older systems.

Otherwise lgtm, this is a clean fix.