Show only the SSH key path input (with Browse button) when auth method
is "key", and only the password input when auth method is "password".
Adds a FilePicker widget for browsing SSH key files, defaulting to
~/.ssh directory.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace `is Select.BLANK` / `is not Select.BLANK` with isinstance
checks, as the sentinel identity varies across Textual versions.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>