Display `~/` instead of full `/Users/<name>/` in tool call path labels

When Claude runs a Bash command, the UI shows the working directory as a full absolute path, e.g. (in /Users/beat/Developer/MyProject). This is noisy, especially on macOS where the home directory prefix is long.

Expected behavior: Substitute $HOME with ~ in the displayed path, e.g. (in ~/Developer/MyProject).

Current behavior: Full absolute path is always shown.

This is a purely cosmetic/display change with no functional impact.