fix(frontend): support Windows shell commands in Claude CLI invocation (ACS-261)#3

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stillknotknown/acs-261-frontend-or-terminal-claude-cli-invocation-hangs-after-environment-override-check-log-on-windowsStillKnotKnown/Auto-Claude:stillknotknown/acs-261-frontend-or-terminal-claude-cli-invocation-hangs-after-environment-override-check-log-on-windowsCopy head branch name to clipboard