Release v1.2.1

Changes

• release: bump version to 1.2.1
• feat(ui): improve theme and sidebar animations
• chore: update macOS Podfile.lock
• fix(sftp): fix macOS SFTP directory listing and improve connection handling
• docs: add SFTP UI improvements design and implementation plans
• feat(sftp): use terminal working directory as initial path
• feat(terminal): detect OS and working directory after SSH connect
• feat(ssh): add osType property to SshService
• feat(terminal): add osType and workingDirectory to TerminalSession
• feat(sftp): auto-create terminal when clicking SFTP