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fix: pass caller's PATH to overlay subprocesses

On macOS with Homebrew (Apple Silicon), overlay subprocesses started via
`sh -c` get a minimal PATH without /opt/homebrew/bin. This causes tools
like git-lfs to not be found, breaking `git diff` inside revdiff TUI.

Fix: capture the caller's PATH and pass it explicitly using each
terminal's native env mechanism:
- tmux: display-popup -e "PATH=..."
- kitty: launch --env "PATH=..."
- wezterm: env "PATH=..." sh -c (no native --env flag)