- src/bin/ui.rs: install_ui_tracing now takes config_level. Filter
precedence is RUST_LOG > config.log_level > info,hyper=warn. The
filter is wrapped in a reload::Layer; Save reinstalls it via
apply_log_level so users don't need to restart for a level change.
Fixes#401 (w0l4i) — config.log_level was previously dead on the
UI binary even though the CLI honored it via init_logging.
- src/tunnel_client.rs: v1.8.1 asserted "AUTH_KEY mismatch" on the
Apps Script placeholder body, but #404 (w0l4i) showed mixed
success/failure on the same script_id, which rules that out. The
body is also returned for Apps Script execution timeout, quota
tear, internal hiccup, and ISP-side truncation. Error message now
enumerates all four candidates and points to DIAGNOSTIC_MODE for
disambiguation.