The macOS setup app drives a shell install script whose output carries
SGR styling, cursor movement, and OSC title commands; the Live output
pane renders log lines as plain text, so those bytes showed up as
mojibake (#112675).
Strip escape sequences at the Rust-to-webview event boundary (bootstrap
and update flows) and collapse carriage-return redraws to the last
visible frame. The on-disk tee keeps the raw bytes for terminal viewing.
Fixes#112675
74466f03cd