Two missing halves of CWD tracking:
1. Frontend: useSftp now listens for ssh:cwd:{sessionId} Wails events
and calls navigateTo() when followTerminal is enabled (default: on).
2. Backend: re-added shell integration injection with stty -echo to
suppress visible command output. Leading space keeps it out of
shell history. Handles both bash (PROMPT_COMMAND) and zsh (precmd).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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