fix(tee): quote recovery hint paths with spaces

[fengjikui]

Summary

Fixes #1858. RTK recovery hints can point at macOS tee files under ~/Library/Application Support/.... When that path is copied into a shell command, agents tend to use backslash-escaped whitespace (Application\ Support), which makes Claude Code ask for permission again.

This keeps simple hint paths unchanged, but renders paths that need shell quoting as copy-paste-safe double-quoted paths. For home-relative paths with spaces, it uses "$HOME/..." instead of quoting ~, because ~ does not expand inside quotes.

Related to #2187, but this keeps the compact ~/... display for simple paths and directly quotes paths with spaces instead of only rendering an absolute path.

Validation

• cargo fmt --check
• cargo test core::tee::tests
• cargo clippy --all-targets -- -D warnings
• cargo test