v1.19.0

Added

• Settings: General, External Tools, SSH — new Behavior options (default branch name, auto-fetch interval, auto-update-submodules); dedicated external diff/merge/terminal tool settings; SSH key management wired to core.sshCommand.

Changed

• Sober line icons replace colored emoji in the Settings navigation.

Fixed

• A Settings navigation label collision (two items both named "General").
• The default branch name wasn't applied when the Init modal opened before settings finished loading.