🎨 style(tests): apply clippy fixes and rustfmt to integration tests

- Fix uninlined format args warnings (10 fixes)
- Remove unnecessary trim() call before split_whitespace()
- Apply rustfmt formatting for consistency
- All integration tests continue to pass after style fixes
- No functional changes, only code style improvements

Cargo.lock

@@ -377,6 +377,7 @@ dependencies = [
  "clap-verbosity-flag",
  "config",
  "env_logger",
+ "futures",
  "google-gmail1",
  "httpmock",
  "lazy-regex",