Complete the inbox app removal after the menu bar hardcode was removed in 7cf74e1c. The inbox was a notification-center placeholder that was never built out, and its background service duplicated a strict subset of chat's cortex event handling. Remove the app files, drop the browser smoke scenario, update app docs, and retarget the daily news description/baseline away from inbox delivery. Also include the pre-existing formatting fix in apps/support/call.py so CI can get past ruff format checks.